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Old 10-30-06, 10:33 PM   #1
urbanknight
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Wow, it works!

So the SFVBC had a warning out that cops in Agoura and Simi are cracking down on traffic violations (both vehicles and bicycles), and mentioned that turning on a red arrow just because it won't change isn't necessarily legal. They recommend (if you have a steel bike) finding the sensor and swaying your bike back and fourth across it. I tried this at a light today when no cars were getting behind me and I think it worked! I might have found a new reason to stay with steel forever!
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Old 10-30-06, 10:37 PM   #2
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I've had pretty good success activating traffic signals with my bike despite a minimum of steel on the thing. Parking right over the edge of the sensor often does the trick. Extort has shown me how having a tire physically on the sensor often works, too. (Perhaps even better than trying to get what little ferrous material I have over the edge of the sensor.) I don't have a 100% success rate between those two methods, but it works most of the time.
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Old 10-30-06, 10:39 PM   #3
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Cool, by edge do you mean the edge closest to the intersection?
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Old 10-30-06, 10:42 PM   #4
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You usually can see an outline of the sensor on the road. You get right on the edge of that outline--doesn't matter which edge--rather than in the middle of the sensor. The sensors are tripped by minute changes in the electrical currents running through them. So putting a ferrous part over the edge can do the trick. Manipulating the current by pressing a tire against the sensor can do it, too.
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Old 10-30-06, 10:59 PM   #5
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I just carry a 10lb magnet in my shorts.
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Old 10-30-06, 11:24 PM   #6
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It doesn't have to be ferrous-- just conducting. The sensors will produce eddy currents in an aluminum rim and detect the resulting fields.
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Old 10-30-06, 11:25 PM   #7
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some lights are more stubborn then others
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Old 10-30-06, 11:41 PM   #8
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When making a right turn if its not changing for me, or when theres a lot of oncoming traffic, ill just hop in the cross walk from the right turn lane then cross when the light changes and continue...
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Old 10-30-06, 11:45 PM   #9
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Quote:
Originally Posted by bitingduck
It doesn't have to be ferrous-- just conducting. The sensors will produce eddy currents in an aluminum rim and detect the resulting fields.
Okay... that makes a bit better sense.
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Old 10-30-06, 11:53 PM   #10
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Quote:
Originally Posted by Mo'Phat
I just carry a 10lb magnet in my shorts.
yeah, me too. a 10lb chick magnet
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Old 10-30-06, 11:54 PM   #11
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Quote:
Originally Posted by dog hair
yeah, me too. a 10lb chick magnet
Where can I get one of those? Does Performance sell them?
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Old 10-31-06, 12:41 AM   #12
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haven't seen them at performance. not that i've looked or anything...
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Old 10-31-06, 12:44 AM   #13
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Quote:
Originally Posted by bitingduck
It doesn't have to be ferrous-- just conducting. The sensors will produce eddy currents in an aluminum rim and detect the resulting fields.

Thankfully I just took an electromagnetism course last quarter so I understood what you said...lol
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Old 10-31-06, 12:44 AM   #14
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Quote:
Originally Posted by dog hair
yeah, me too. a 10lb chick magnet
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Old 10-31-06, 12:48 AM   #15
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Someone posted this at TE a while back...

http://www.humantransport.org/bicycl...nals/green.htm
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Old 10-31-06, 02:05 AM   #16
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Where exactly is the sensor???
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Old 10-31-06, 06:16 AM   #17
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If there is a particular intersection where the light won't trip, you can contact the city to adjust the sensitivity.
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Old 10-31-06, 08:37 AM   #18
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Quote:
Originally Posted by jschen
Where can I get one of those? Does Performance sell them?
Hi-Tech Bikes has them...strangely, in their "Ultra-Lightweight Parts" section. Odd.
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Old 10-31-06, 11:20 AM   #19
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...or get one of these.
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Old 10-31-06, 11:32 AM   #20
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Quote:
Originally Posted by The Fixer
...or get one of these.
The problem with that is that most cities around here don't have the sensors. According to a cop I know, Buena Park is the only city in OC that uses them.

I recently asked a Cypress cop if I was likely to get a ticket for blowing red left turn arrows and he told me that none of the guys he knows would bother. Only reason I asked was because I was about to run the light when I saw him coming up behind me, so I stopped.
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Old 10-31-06, 03:29 PM   #21
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Quote:
Originally Posted by ovoleg
Where exactly is the sensor???
You'll see a circle or an octagon in the asphalt, the outline being a crack or rubber strip. The light I tried this on actually has 3 of them, probably to tell how many cars are waiting.

Quote:
Originally Posted by Mo'Phat
I just carry a 10lb magnet in my shorts.
Oh, so THAT'S what that was. The gals will be disappointed.
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Old 10-31-06, 04:14 PM   #22
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I put my chainring directly above the outline of the sensor. Works about 80% of the time.
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