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Using DLLP to avoid inadvertent drift collisions

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Old 09-29-06, 10:27 PM
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Originally Posted by tomcryar
As soon as I saw "ruralish" I stopped................
I didn't stop, but I chuckled.
Isn't Rural ALREADY an adjective?

But when all is said and done, I agree with HH's arguments, even though I think his reputation shoots his credibility in the foot.

For instance:
the main reason to merge left into the main traffic lane out of the shoulder or bike lane is always to make yourself more conspicuous to potential cross traffic
Anyone who's racked up road miles can't argue with that. Left hooks, and T-bones are lessened by being where opposing cagers have their eyeballs.
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Old 09-29-06, 11:57 PM
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Good job on the opening post explaining the DLLP technique and including answers to the frequently asked questions. Hopefully, this means we won't have to read about it in almost every other thread now, as promised here:

Originally Posted by Helmet Head
In order to stop engaging in discussions about "using DLLP to avoid inadvertent drift collisions" in every thread in which it seems relevant, I would like to devote this one thread to that topic, and stop engaging in this debate in other threads.
I have read practically all of the posts in every thread regarding this controversial technique. I fail to understand how anyone can argue that a cyclist on the shoulder is going to be just as relevant to a motorist as one who is directly in their path. When a motor vehicle driver sees anything directly in their path, bells and whistles go off in their head, because they KNOW that if they proceed, there will be a collision. As long as the cyclist moves right (onto the wide shoulder) well in advance, I don't see how it could be considered unsafe or discourteous.

The fear that this may set up motorist expectation that a cyclist will always move over for motor traffic is a valid point. In areas with heavy bicycle use I would recommend against it for this reason. However in other area's like mine, where I almost never see a cyclist on my rural roads, it forces drivers to pay attention. Then when they see the cyclist move over, they see that as being courteous. Win, win.

I really don't see what the big fuss is about on this issue, other than it's been presented relentlessly on too many threads by one member. If you like the technique, use it. If not, don't.

Last edited by AlmostTrick; 09-30-06 at 07:26 AM.
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Old 09-30-06, 08:09 AM
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Originally Posted by Bikepacker67
Anyone who's racked up road miles can't argue with that. Left hooks, and T-bones are lessened by being where opposing cagers have their eyeballs.
That's a different issue...

HH's theory is not about how to handle intersections (the source of most car-bike collisions). It is specifically limited to straight rural roadways with wide outer lanes and no driveways.
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Old 09-30-06, 08:37 AM
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HH's conjectured theory is based on half baked conscepts and a phrase he pulls out of context from an article written to minimize lialibility in the legal arena. his patented "PEEK-A-BOO" technique is patently unsafe because it places a bicyclist swerving in front of every vehicle only to swerve out of the way in the last seconds before impact.


do not let a moment of YOUR innatention contribute to an accident, near miss, or angry drivers.

riding "PEEK-A-BOO" is unsafe, unwise, much more ambigious and exponentially more dangerous by placing a bicyclist in the path of EVERY car on the road unececessarily.

Ridning "PEEK-A-BOO" is exponentially more dangerous than keeping as far right as practable- the widely, almost universally accepted standard of bicycle piloting on roadways - and contribues to greater hazards to both bicyclist AND car traffic.

this does NOT mean a bicyclist shouldn't take the lane whenever necessary to avoid upcoming hazards. Howeve, riding "PEEK-A-BOO" (tm) lane default and swerving out of every upcoming or overtaking vehicle to then ride safely in a more appropriate position IS unsafe.

like head says, he rides safely in shoulders and bike lanes all the time.

what HH fails to follow through with his logic, that if a shoulder or bike lane is considered by a bicyclist SAFE in the PRESENCE of traffic, does NOT become UNSAFE in the ABSENCE of traffic.

So, Bikepacker, you weave unecessarily in and out of twelve foot shoulders on curvy, hilly, highway speed roads too, just like helmet head, in paranoid fears of 'cognitive inconspicuity?'

you, bikepacker, one of many high mileage types, would seem to be more aware of consistent lines versus swerving, the absolute visibility of high vis safety item trumping cognitive inconspicuity, and also understand safe roadway positioning.

or do you do the "PEEK-A-BOO" 2?

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Old 09-30-06, 08:50 AM
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why does all of this sound suspicously like a bad case of TUNNEL VISION......drivers only notice things right in front of them? what a crock! oh, that's right, head thinks drivers only are responsible for noticing things directly in their path......

"I got.....tunnel vision".......PEEK-A-BOO...... sike!

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Old 09-30-06, 09:52 AM
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Originally Posted by SSP
That's a different issue...

HH's theory is not about how to handle intersections (the source of most car-bike collisions). It is specifically limited to straight rural roadways with wide outer lanes and no driveways.
This specific part of the theory is not about handling intersections. But if you've paid any attention, you'd know that avoiding inadvertent drifts is just a small part of why a cyclist would choose to ride this way. The rest of the reasons are for becoming more conspicuous to oncoming and cross traffic.
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Old 09-30-06, 09:59 AM
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Originally Posted by vrkelley
It's your theory,you prove it. And if no one else has done it...how about reporting back after you've done say 1,000 weaves under various riding conditions. I'm not about to risk my hide.

EDITED: It looks like there are already 2 strong personal studies disproving your theory.

https://www.bikeforums.net/advocacy-safety/231399-observations-daytime-static-lane-positioning.html Observations from some real-world "Static-Lane-Positioning"
https://www.bikeforums.net/advocacy-safety/231287-observations-some-real-world-static-lane-positioning-testing.html Observations of daytime, static-lane positioning
Not trying to sound like HH, but have you read the "Bike Lane Deaths" thread? I think that's plenty of proof that inadvertent drift does happen. And if you ride on narrow roadways where motorists can't do anything but notice you or hit you, you'll see that motorists do take plenty of notice of what's up ahead of them in their lane. Is it a perfect conclusion? Maybe not but neither is any conclusion from a scientific test. And, if you needed any more reason to try DLLP than avoiding inadvertent drift, just take a look at the vast majority of cyclist/motorist collisions and see how easily that could have been avoid if the cyclist had been centered in the traffic lane.
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Old 09-30-06, 10:05 AM
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Originally Posted by Helmet Head
In order to stop engaging in discussions about "using DLLP to avoid inadvertent drift collisions" in every thread in which it seems relevant, I would like to devote this one thread to that topic, and stop engaging in this debate in other threads.

I will start by presenting the theory (a "hypothesis" in scientific terms). This includes some definitions of terms that I use, the premises the theory is based on, the reason, conclusions, and some FAQs. I hope this helps.

Definitions
  • ruralish - any non-urban road with long stretches of no intersections.
  • DLLP - Dynamic Lateral Lane Positioning - a cycling methodology that emphasizes use of lateral lane positioning for increasing conspicuity and predictability.
  • look back - A clear and obvious look back over your shoulder for longer than "just a glance".
  • merge - moving laterally in a safe and predictable fashion... for a bicyclist that means only after looking over the shoulder on the side on which he plans to move in order to verify it is clear and safe to make the move.
  • weaving - to move back and forth between two lateral positions with a period of less than 10 seconds.
  • fog line - a stripe at the edge of the road that vehicle drivers are not supposed to cross.
  • shoulder - any paved portion of the road to the right of the fog line.
  • bike lane - a shoulder that is designated by signs and/or markings to be a "bike lane".

Premises (these must be taken on faith or my argument will not be persuasive):
  1. In a "ruralish" (non urban) environment on a quiet low traffic open highway with good sight lines, a potential obstacle up ahead in a motorist's intended path in his lane is much more likely to be relevant to that motorist than is the same object up ahead in the shoulder or bike lane.
  2. We are much more likely to notice things which are relevant to us in some way.
    Source: https://www.visualexpert.com/Resource...blindness.html
  3. If you're more likely to be noticed, you're less likely to be overlooked.
  4. A contributing factor in the type of inadvertent drift collisions cited in the bike lane deaths thread is the motorist overlooking the presence of the cyclist
  5. Another factor in those inadvertent collisions is the motorist choosing to attend to a distraction that he probably would not choose to attend to, or would not choose to attend to as long, if he had noticed and was aware of the cyclist up ahead.
  6. The inadvertent drift collisions occur when the distracted motorist drifts into the shoulder or bike lane while attending to a distraction.
  7. On long straight stretches of road, motorists who are following someone else relatively closely (i.e., gap to vehicle in front of them is less than 5 seconds) are much less likely to choose to take their eyes off the road for a long enough time to drift significantly out of their path than are motorists who have an relatively empty road (intended path is clear from vehicle to point that they won't reach for at least 5 seconds) in front of them; the longer the gap, the more likely they are to take their eyes off the road to attend to a distraction for a long enough time to significantly drift out of their path.
  8. There is no legal requirement for cyclists to "keep to the right" when same direction traffic is not present.
  9. On most ruralish narrow roads with no shoulders, it is safe to cycle there even though doing so requires every approaching motorist to notice the cyclist in order to not hit him.

Reasoning:
  1. Per A, a cyclist up ahead in a motorist's intended path in his lane is much more likely to be relevant to that motorist than is the same cyclist riding up ahead in the shoulder or bike lane.
  2. Per B, the cyclist that is more relevant is more likely to be noticed by the approaching motorist.
  3. Per C, the cyclist that is more likely to be noticed is less likely to be overlooked.
  4. Per D, E and F, the cyclist who is less likely to be overlooked is less likely going to be inadvertently drifted into.

Conclusion
Per the above reasoning, it's safer to be up ahead in the motorist's lane than up ahead in the shoulder or bike lane: you're more likely to be noticed, and therefore less likely to be inadvertently drifted into.

Therefore, what I often do when there is no same-direction traffic is merge left into the main traffic lane, and stay there until I notice with my mirror faster traffic approaching from behind. When they are about 10 seconds back, I do a right shoulder check and move back into the shoulder or bike lane.

FAQ
  1. Why would you want to weave back and forth in and out of the lane like that? It's not weaving. The technique normally involves maintaining a given lateral position for at least 10 seconds, almost always much longer, before moving back to the other position.
  2. If you're in the shoulder or bike lane being passed by cars, and then there's a gap, what is the minimum that gap has to be in order to move back into the traffic lane? I will rarely move back into the traffic lane unless I can see that the gap to the next vehicle approaching from behind is at least 20 seconds. If it's less than that, I might move out to the right tire track for a few seconds, then move back, just to increase the chances of them seeing me, demonstrating look backs and clear arm signalling for each merge.
  3. Would you do this without a mirror? Only on quiet slow roads. On roads with fast traffic (35+ mph speed limits), I would not do it without a mirror.
  4. How does a shoulder that is safe for cycling while being passed by motorists become less safe when same-direction faster traffic is not present?. During the gaps in same-direction traffic, the next motorist to be approaching is more apt to paying less attention to the road (see Premise G above), and, therefore, more likely to take his eyes off the road long enough to drift into the shoulder or bike lane. That's why it's less safe to be in the shoulder during gaps in same-direction traffic.
  5. It seems like a lot of work. Is it? You say "work", I say "paying attention", and that's a good thing. In a shoulder or bike lane it's all too easy to lapse into a mindless wandering of thoughts where we can become as oblivious to traffic as some of the overtaking motorists are to our presence. That's not good. Staying engaged in DLLP helps keep the cyclist alert and paying attention to what is going on around him. That's good. It's good to notice in your mirror that there is no same-direction traffic and to move out into the main traffic lane, and to pay attention with your mirror (a microsecond glance every 3-5 seconds all it normally takes) to note when traffic is approaching from behind, and to move out of the way when you've been out there long enough in their path for them to have been very unlikely to still not have noticed you.
  6. If a driver is not paying attention, how is he going to notice you regardless of where you are riding? Drivers periodically and frequently, if not constantly, pay attention to their intended path, or they would be driving off the road all the time. The point of this technique is to do be out their in their intended path long enough so that it would be virtually impossible for them to notice you, because that would mean they were not paying attention to their intended path for so long, there is no way they could stay on the road.
  7. But this technique is supposedly about avoiding "inadvertent drift", which is exactly that - drivers not paying attention to the road so long that they can't stay on the road. It's a timing thing. What you want to do is try to get their attention when they're still so far back (more than 20 seconds), that if they're already not paying attention at that point, they'll drift off the road and crash long before they reach you. Odds are, that that's not going to happen, and one of their periodic/frequent checks on the road ahead is when we're counting on being noticed. If, instead, during one of those checks, we're in the shoulder, then we're much less likely to be noticed. That's the point of this technique: to be in the space where the motorist is paying attention when he's paying attention..
  8. But since some motorists are not expecting to see a cyclist in the road up ahead, aren't we prone to inattentional blindness when we're in the road? First, the expectations for cyclists in the road is probably not any signficantly different on the narrow roads, yet they don't seem to hit cyclists on those roads because of inattentional blindness. Second, the technique involves moving aside into the shoulder to be considerate and to accomodate their easier passing of us. In the highly unlikely event that they haven't noticed us despite us being in their path, it doesn't matter, because we're moving out of their path anyway (as opposed to what we do on narrow roads - stay in their path). Finally, the likelihood of the motorist not seeing the cyclist in his path, combined with the low likelihood of the DLLP cyclist not noticing the approaching motorist in his mirror, and so staying in his path and not moving aside, becomes an extremely unlikely event. See the bike lane deaths thread for examples of much more common (and therefore more likely) events.
  9. The difference in angle of vision between a cyclist up ahead in the shoulder and a cyclist up ahead in the traffic lane, when the motorist is 20 seconds back, is so light, how can one cyclist be more noticable than the other? The argument has nothing to do with angles (which has to do with sensory conspicuity) and everything to do with relevance, a key aspect of cognitive conspicuity. That's not to say that relevance is required to be noticed, just that relevance makes something much more likely to be noticed (see Premise B). What makes a cyclist up ahead relevant to motorist is not whether he can see him (because we're assuming he can see the cyclist), but where the cyclist is relative to where the motorist is going (or at least thinks he's going). It is normal and natural for the subconscious mind to assume that a cyclist in the bike lane or shoulder is going to continue riding in the shoulder, and that the motorist will not enter the shoulder, and, therefore, the cyclist is not relevant to the motorist.

Changes
I reserve the right to update the presentation of this theory in this OP, but will always note edits here in this section, and, when signficant and appropriate, will make a post about the change.
  • Added FAQ #5, #6, #7, #8, #9

Who ever knew riding a bike could be so complicated?
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Old 09-30-06, 10:37 AM
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Take a few logic and reasoning classes and edit the OP.

Yikes. 9 assumptions? In terms of necessity and sufficiency, you assert that the NINE assumptions must be taken on faith for the argument to be persuasive. If you take them to be necessary, which is what you've implied, and I reject what you label A, then your argument loses its so-called force. (In fact I do reject A).

If you want to formalize an argument, which you appear to want to do, at least use accepted terminology. You have premises and conclusions -- the section that you call "reasoning" appears to be what should be "conclusions". Arguments are described as valid and as sound -- validity is an assessment of the structure of an argument, soundness is an assessment of the truth of its premises. Show us the logical structure of your argument and demonstrate that the structure is valid. Then show us that your premises are true. Notice that if your premises are as complicated as those that you present, it will take further arguments to show this.

That said, I would advise against trying to come up with a deductive argument in favor of whatever you call your riding style.

It's not a theory.

It's not a hypothesis.

It's a technique.

Safe riding comes from developing a competency at using a wide variety of techniques, including but not limited to this one.
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Old 09-30-06, 10:39 AM
  #35  
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Originally Posted by joejack951
Not trying to sound like HH, but have you read the "Bike Lane Deaths" thread? I think that's plenty of proof that inadvertent drift does happen. And if you ride on narrow roadways where motorists can't do anything but notice you or hit you, you'll see that motorists do take plenty of notice of what's up ahead of them in their lane. Is it a perfect conclusion? Maybe not but neither is any conclusion from a scientific test. And, if you needed any more reason to try DLLP than avoiding inadvertent drift, just take a look at the vast majority of cyclist/motorist collisions and see how easily that could have been avoid if the cyclist had been centered in the traffic lane.
Can you say... cherry picking? That's all I have to say about that. It shows nothing more than that bicycle accidents do happen in bike lanes - nobody disputes that. It does not address the implied corollary that less accidents happen in the traffic lanes. It's the rule of large numbers. Even if you have a 1 in a million chance of something happening, if there are million cyclists riding in the US every day, then the "1 in a million" chance means it happens once a day. Sounds like a lot, but the odds are still 1 in a million. That it is being reported more often simply means that newspapers are starting to take note of cyclists, and instead of getting the two paragraph on page 12 treatment, it gets the full column on page 1 treatment - especially in the Pacific NW where cycling is gaining in popularity faster than in other places. Also, more and more newspapers are on the internet, where the articles can be found easily and posted to websites like this.

In fact, the TexDOT bike lane/WOL study has a literature review showing that there is at least one survey of traffic accidents which finds that accidents in bike lanes account for a very small percentage of accidents (~2%) with most other accidents happening in traffic lanes.

Originally Posted by JJ
...
And, if you needed any more reason to try DLLP than avoiding inadvertent drift, just take a look at the vast majority of cyclist/motorist collisions and see how easily that could have been avoid if the cyclist had been centered in the traffic lane.
Got a source for this tidbit of information? I strongly suspect that this is just pulled out of your arse.

Your foundation is extremely weak, so I choose to go with my own experience, which happens to reject most of what you suggest. Not all of it is wrong. But my experience suggests that centering yourself in the standard width lane as a "default position" is almost never necessary. A "taking the lane" maneuver is done when there is a reason; i.e. destination positioning at intersections, or taking a lane when road conditions prohibit lane sharing. On a road with a shoulder or bike lane, just being near the white line works fine. On rural roads with no shoulder, a position a foot or so to the left of the white line is plenty unless there is a blind corner ahead. "Taking the lane" is a transient condition dictated by local traffic and road conditions. There are guidelines for when to "take the lane," but there are no hard and fast rules I have found from my riding experience.

"DLLP" also has nothing to do with the traditional "taking the lane" maneuver (since you end up letting the car pass immediately, "taking the lane" is a way of getting traffic behind you to not pass you immediately). Rather, it is a technique to solve a very small problem while creating a host of others. My alternative, to simply stay close to the line denoting the bike lane or shoulder, solves this problem as well, but without the need to scan a mirror every 5 seconds and without causing a "panic reaction" in motorists coming from behind. I am still convinced that the safest motorist is the one who has the most information about the intent of the cyclist he is passing. Anything to make the actions of the cyclist less predictable is a safety hazard. This is what my experience has taught me.

This is my experience. Your weakly founded theories are not enough to change my mind on the matter. Now, experiences differ across different regions of the world. If I were to move away from my present home and into a different city which requires a somewhat different riding style, I will adapt. But it remains that there is no unified theory of lane positioning - only guidelines and advice on what to look out for. And I maintain that the extreme maneuvers dictated by "DLLP" are unnecessary and potentially hazardous.
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Old 09-30-06, 10:50 AM
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Originally Posted by Brian Sorrell
Take a few logic and reasoning classes and edit the OP.

Yikes. 9 assumptions? In terms of necessity and sufficiency, you assert that the NINE assumptions must be taken on faith for the argument to be persuasive. If you take them to be necessary, which is what you've implied, and I reject what you label A, then your argument loses its so-called force. (In fact I do reject A).

If you want to formalize an argument, which you appear to want to do, at least use accepted terminology. You have premises and conclusions -- the section that you call "reasoning" appears to be what should be "conclusions". Arguments are described as valid and as sound -- validity is an assessment of the structure of an argument, soundness is an assessment of the truth of its premises. Show us the logical structure of your argument and demonstrate that the structure is valid. Then show us that your premises are true. Notice that if your premises are as complicated as those that you present, it will take further arguments to show this.

That said, I would advise against trying to come up with a deductive argument in favor of whatever you call your riding style.

It's not a theory.

It's not a hypothesis.

It's a technique.

Safe riding comes from developing a competency at using a wide variety of techniques, including but not limited to this one.
+1

Well said. Brian, you should reveal your background on the matter of logical argument. Helmet Head is an amateur philosopher. Brian, I believe you are not quite, yes?

All I am saying is that HH's technique is something that works for him in certain situations he comes across. It is not a unified theory by any means. I have heard enough replies from other, experienced, cyclists, as well as my own experience, to know that this is not a technique to use everywhere. Sometimes "inadvertent drift" is not the main concern. Moreover, there are other techniques which solve the "inadvertent drift" problem without causing so many others.
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Old 09-30-06, 10:56 AM
  #37  
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Originally Posted by joejack951
Not trying to sound like HH, but have you read the "Bike Lane Deaths" thread? I think that's plenty of proof that inadvertent drift does happen.

Thanks JoeJack. I found it. https://www.bikeforums.net/vehicular-cycling-vc/143989-bike-lane-deaths.html. It lists drift incidents over the period of 1 year:

Post 1 Fatality
Post 59 Wound
Post 63 Fatality
Post 128 Fatality
Post 167 Fatalities (2) ---->ADDED

EDITED: to 5 fatalities
We have 5 known fatalities due to lane drift. Anyone got comparisions between the lane fatalities and street riding fatalities? I'll look also.

Last edited by vrkelley; 09-30-06 at 11:59 PM.
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Old 09-30-06, 11:04 AM
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Originally Posted by Helmet Head
Brian, show me one post from you or John in that thread that addresses this argument to which I did not respond, and you're on.

By the way, I spent a lot of time reading what John wrote, and explained at length why most of it was completely irrelevant to this argument. And about half of that thread was eaten up by John coming up with one lame excuse after another for not accepting the truth of the one statement I quoted from the inattentional blindness article (see Premise B above). Page after page I explained fully why each excuse was so lame. He never stuck to a single excuse. He kept conjuring new ones. The last one was completely pathetic (he was assuming a different meaning from the one Green was using), and that's where it ended. Why bring all the garbage into this thread.

While both of you made very interesting comments, none of them addressed this argument that I did not refute. Plus, some of what was learned in that thread, and the 2 or 3 others where this was discussed recently, have been incorporated into this presentation of the complete argument. That's what I want addressed. Am I missing anything here? That's what I want to know. If you don't want to help, fine.
Again, the insults. You are just rude. And did you act any better? All you did was whine and "demand" the answer to two, irrelevent, yes or no questions. Everyone was arguing about why your two yes or no questions, which you meant as a retorical trap, were irrelevent. Instead of responding, all you did was whine. So you started a new thread... Typical.

You have no credentials, beyond that you ride a bike, which everyone here does. John, perhaps, was arguing above your level. He has experience in this type of thing as a professional that you lack. No wonder you did not understand his arguments to the subject. I understood, and others understood. You alone here didn't understand and simply whined that he was beating you; that he wasn't falling for your amateurish retorical traps. No wonder you started a new thread. Just like a spoiled kid losing a checkers game, you simply threw a fit, upset the board, and started over.
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Old 09-30-06, 11:11 AM
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Originally Posted by vrkelley
Thanks JoeJack. I found it. https://www.bikeforums.net/showthread.php?t=143989. It lists drift incidents over the period of 1 year:

Post 1 Fatality
Post 59 Wound
Post 63 Fatality
Post 128 Fatality

We have 3 known fatalities due to lane drift. Anyone got comparisions between the lane fatalities and street riding fatalities? I'll look also.
Search down for the TexDOT study (I believe the title was something like "UT study on bike lanes" or something to that effect). It contains a literature review which discusses a study which compares bike lane fatalities to street riding fatalities. Dispite what some people want you to believe, there are surveys on this subject, and it tends to confirm the logic that bike laned roads are safer than roads with no bike lanes. All the studies which Forester, himself, surveys come to the conclusion that "inadvertent drift," which is classified as a "hit from behind" accident, are extremely rare, which forms the basis for the vehicular cycling technique in the first place. These being rare means that there is a basis for riding closer to the traffic stream and the basis for "taking the lane" maneuvers which are widely accepted by experienced cyclists. But this "DLLP" technique is Helmet Head's alone; very few, even in the "VC community" (by which I mean VC message boards and such) agree with his assessment and riding technique.
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Old 09-30-06, 11:14 AM
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Originally Posted by Brian Ratliff
Again, the insults. You are just rude. And did you act any better? All you did was whine and "demand" the answer to two, irrelevent, yes or no questions. Everyone was arguing about why your two yes or no questions, which you meant as a retorical trap, were irrelevent. Instead of responding, all you did was whine. So you started a new thread... Typical.

You have no credentials, beyond that you ride a bike, which everyone here does. John, perhaps, was arguing above your level. He has experience in this type of thing as a professional that you lack. No wonder you did not understand his arguments to the subject. I understood, and others understood. You alone here didn't understand and simply whined that he was beating you; that he wasn't falling for your amateurish retorical traps. No wonder you started a new thread. Just like a spoiled kid losing a checkers game, you simply threw a fit, upset the board, and started over.

Very well stated. Thank you.
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Old 09-30-06, 11:14 AM
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...Brian, would you post the link if you find it?
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Old 09-30-06, 11:35 AM
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Originally Posted by Brian Ratliff
Again, the insults. You are just rude... You have no credentials
That all may be true. But HH identified a point that people are dying due to drift. I don't agree with his theory but perhaps someone else will cook up a better technique that will prevent deaths.

That's my hope anyway...otherwise, I would have already bailed on this whole forum.
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Old 09-30-06, 11:39 AM
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Originally Posted by Brian Ratliff
Search down for the TexDOT study (I believe the title was something like "UT study on bike lanes" or something to that effect). It contains a literature review which discusses a study which compares bike lane fatalities to street riding fatalities. Dispite what some people want you to believe, there are surveys on this subject, and it tends to confirm the logic that bike laned roads are safer than roads with no bike lanes. All the studies which Forester, himself, surveys come to the conclusion that "inadvertent drift," which is classified as a "hit from behind" accident, are extremely rare, which forms the basis for the vehicular cycling technique in the first place. These being rare means that there is a basis for riding closer to the traffic stream and the basis for "taking the lane" maneuvers which are widely accepted by experienced cyclists. But this "DLLP" technique is Helmet Head's alone; very few, even in the "VC community" (by which I mean VC message boards and such) agree with his assessment and riding technique.
Brian, if you are confusing inadvertent drift with a hit from behind accident, then you are completely missing the point.

THE main argument given by people on this board in opposition to HH's advice is that a cyclist "taking the lane for no reason" WILL get hit from behind by faster moving traffic. If you accept that, then you cannot accept vehicular cycling at all.
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Old 09-30-06, 11:51 AM
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Originally Posted by vrkelley
...Brian, would you post the link if you find it?
https://www.bikeforums.net/advocacy-safety/229672-ut-study-bike-lanes.html

In the article is a link to the pdf of the study.
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Old 09-30-06, 11:54 AM
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Originally Posted by joejack951
Brian, if you are confusing inadvertent drift with a hit from behind accident, then you are completely missing the point.

THE main argument given by people on this board in opposition to HH's advice is that a cyclist "taking the lane for no reason" WILL get hit from behind by faster moving traffic. If you accept that, then you cannot accept vehicular cycling at all.
That's not true at all...most of us are not saying that. We're saying there's no evidence that DLLP increases conspicuity or decreases the risk of accident. Most of us are assertive VC-style riders who take the lane whenever necessary. But, DLLP is simply not necessary.
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Old 09-30-06, 11:54 AM
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Brian - thanks for post #35. Very well stated.
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Old 09-30-06, 11:58 AM
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You do know that this site is advertising, right? Thousands of satisfied customers...I mean studies...
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Old 09-30-06, 12:44 PM
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I'm on page 1 and don't really care to read page 2 (or page 3 if that was created while I was reading). I just wanted to post more lyrics from my song currently being polished and recorded (albeit amateurly), "The DLLP Rag."

Wear bright sleeves when doin' the POWERWEAVE
And doin' the DLLP Rag!
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Old 09-30-06, 02:34 PM
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When people say that they adjust position for the primary reason of increasing conspicuity to motorists, it is a red flag to me. Although that is one of the prime messages of LAB/EC/VC whatever, the mantra of stay 'visible and predictable' to motorists, in my opinion it is a miserable philosophy, a grave disservice to cyclists, and an ugly example of putting the cart before the horse. Let me explain...

Increasing conspicuity is a helpful BONUS of leftward positioning, it's a wonderful fantastic thing, but not the reason for doing it. Why move left then? Move left to improve your own personal sight lines, and to create a buffer of space and time between yourself and inevitable intrusions from the right. When folks put 'increase visibility and predictability to motorists' above these reasons, at the top of their lists of reasons for 'DLLP' in urban areas, it tells me that they are still in the wrong frame of mind for dealing with traffic. They still put too much faith in drivers, they still offer them bits of the responsibility for their own safety that are better held by the cyclist. It is responsibility better held by the cyclist because, no matter if you have maximized conspicuity to motorists in every sense, there will still be those who fail to notice your presence. That's a fact. That's inevitable.

The concept of lateral lane positioning is a strategy for mitigating danger from CROSS-TRAFFIC and is closely linked with cycling speed. "At moderate, ho-hum urban-cycling speeds, the rider will not have to be too concerned about maintaining a buffer zone unless the street is lined with parked cars. Streets with clear edges, few pedestrians, a view all the way to the curb, and good lines of sight to any driveways, alleys, or intersections can be ridden safely all the way to the right if one wishes." (p. 76. A of UC)

All these discussions of increasing conspicuity on rural roads reveal (1) the same bizarre over-obsession with same-direction traffic that has infected cycling safety discussions since the 70's and which I believe created the Vehicular Cycling movement in a lightning flash of irony that was too bright to look at directly, and (2) a misplaced faith in lane position as an effective means of ensuring conspicuity.

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Old 09-30-06, 03:01 PM
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Originally Posted by vrkelley
Thanks JoeJack. I found it. https://www.bikeforums.net/showthread.php?t=143989. It lists drift incidents over the period of 1 year:

Post 1 Fatality
Post 59 Wound
Post 63 Fatality
Post 128 Fatality

We have 3 known fatalities due to lane drift. Anyone got comparisions between the lane fatalities and street riding fatalities? I'll look also.
In 1999 the City of Toronto in Ontario, Canada did a detailed analysis of all bicycle-motor vehicle collisions over the previous 2 years; this was at the behest of the coroners office and was undertaken by the city traffic services department, this report is available online.

Out of 2572 collisions, 629 involved sidewalk or crosswalk riding, darkness or poor visibility 355, improper or unsafe lane change (motorist) 68, cyclist impaired 9, motorist failed to detect cyclist 5, motorist impaired 3. I have not listed all the instances, if you want to know the rest, read the report. For all of HHs rantings, the important thing here only .19% of all instances involved a failure to detect. Drifting into the bike lane, would be a subset of failure to detect.

More important issues, 25% involved sidewalk/crosswalk instances, and 14% involved a lack of lights, in other words if we spend $5,000,000 on bicycle safety, where do we get the most benefit, adding rumble strips to roads to prevent drift, or by increasing enforcement of laws that prohibit sidewalk riding, and making lights mandatory for street bicycles. In fact I would like to see minimum standards for bicycle lighting, similar to the standards for automobile lighting.
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