New Edition of the MUTCD
#1
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
New Edition of the MUTCD
On Tuesday, December 19th, 2023, the 11th Edition of the US Manual on Uniform Traffic Control Devices (MUTCD) was published by the USDOT Federal Highway Administration (FHWA). This is the first all-new edition of the MUTCD in 14 years, and culminates well over a decade of research, experimentation, evaluation, and testing of existing and new signs, markings, signals, beacons, channelizers, and other devices. This also follows a three-year period of rulemaking and regulatory review, where over 100,000 comments were submitted on the draft material.
The new edition of the MUTCD is the national standard for all signs, markings, and other traffic control devices for roads, streets, highways, and bikeways across the US per 23 CFR 655 as of January 18th, 2024. States are required to either adopt the national MUTCD or develop a FHWA-approved state supplement or MUTCD within two years of the effective date above.
Although devices that affect bicyclists are found throughout the MUTCD, the Part of the MUTCD that focuses on bicycle facilities is Part 9. Part 9 in the 11th Edition is over twice as big as the 2009 Edition, contains substantial new information, and incorporates several Interim Approvals such as for bicycle signals and turn boxes.
Links:
MUTCD website: https://mutcd.fhwa.dot.gov/
Part 9: https://mutcd.fhwa.dot.gov/pdfs/11th_Edition/part9.pdf
Disclaimer and Disclosure: I am currently under contract to a nonprofit organization (NCUTCD) that advises FHWA on MUTCD content. I also served as chair of the NCUTCD Bicycle Technical Committee from 2002-2017. NCUTCD does not own or control the MUTCD, and operates in an advisory capacity through the public input process. for more information on NCUTCD, see https://ncutcd.org/aboutus/. This comment / announcement / thread does not represent the options or positions of NCUTCD, FHWA, or any other organization.
The new edition of the MUTCD is the national standard for all signs, markings, and other traffic control devices for roads, streets, highways, and bikeways across the US per 23 CFR 655 as of January 18th, 2024. States are required to either adopt the national MUTCD or develop a FHWA-approved state supplement or MUTCD within two years of the effective date above.
Although devices that affect bicyclists are found throughout the MUTCD, the Part of the MUTCD that focuses on bicycle facilities is Part 9. Part 9 in the 11th Edition is over twice as big as the 2009 Edition, contains substantial new information, and incorporates several Interim Approvals such as for bicycle signals and turn boxes.
Links:
MUTCD website: https://mutcd.fhwa.dot.gov/
Part 9: https://mutcd.fhwa.dot.gov/pdfs/11th_Edition/part9.pdf
Disclaimer and Disclosure: I am currently under contract to a nonprofit organization (NCUTCD) that advises FHWA on MUTCD content. I also served as chair of the NCUTCD Bicycle Technical Committee from 2002-2017. NCUTCD does not own or control the MUTCD, and operates in an advisory capacity through the public input process. for more information on NCUTCD, see https://ncutcd.org/aboutus/. This comment / announcement / thread does not represent the options or positions of NCUTCD, FHWA, or any other organization.
__________________
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Last edited by RCMoeur; 12-19-23 at 09:56 AM. Reason: expanded disclaimer
Likes For RCMoeur:
#2
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
In case the question comes up: in the announcements and other info, FHWA has indicated that a revision to the MUTCD will be forthcoming in due time to incorporate the provisions of PROWAG, adopted by the US Access Board earlier this year. This will be a complicated process on FHWA's part, so it may not happen immediately, but it is expected to go into rulemaking at some (undefined) time in the future.
__________________
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Likes For RCMoeur:
#3
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,699 Times
in
2,519 Posts
Unless I missed it, you buried the most important part, "share the road" signs are no longer approved. And it seems like they modified the "bicycles may use full lane" sign to use a picture of a bicycle.
But I only know what I saw on social media.
But I only know what I saw on social media.
#4
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
The Bicycles Allowed Use of Full Lane is a legend change from the current Bicycles May Use Full Lane sign. The stated reason from FHWA is that in their judgment the older sign legend could be interpreted as a warning message, while they state the revised message is more consistent with regulations on road use. Both signs used bicycle symbols.
There are many more changes, so I didn't try to emphasize any specific ones. There may be a presentation developed by FHWA or NCUTCD highlighting significant changes in Part 9 and other Parts, but these are not yet available.
A list of specific changes and FHWA's stated reasons for those changes can be found in the docket at https://downloads.regulations.gov/FH...tachment_1.pdf
__________________
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Last edited by RCMoeur; 12-19-23 at 05:10 PM.
#5
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,699 Times
in
2,519 Posts
I thought getting rid of share the road signs was pretty consequential given how often cyclists complain about it. It's nice to know that they do actually listen, and I assume that's a sign that bike lobbying works, although I haven't seen anyone claim credit for it.
#7
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
I thought getting rid of share the road signs was pretty consequential given how often cyclists complain about it. It's nice to know that they do actually listen, and I assume that's a sign that bike lobbying works, although I haven't seen anyone claim credit for it.
It's a long process to revise the MUTCD, and the process has many levels of deliberation and review, but the process makes sense as the final product may end up being a national standard for many decades, and so thorough analysis and input from experts, organizations, the full range of road users, and the public is a good thing in that it can result in the most appropriate technical guidance making it into the final edition.
In the case of "share the road", as noted earlier it originated with farm equipment interests as a plaque to be used with vehicular warning signs. Agencies saw this as a plaque that could be used with bicycle signs to advise road users of bike use, and that was when the reports of "varying interpretations" (e.g. drivers yelling at bicyclists legally using a roadway that "they weren't sharing!!") started coming in. However, discontinuing the Share the Road plaque had to wait until improved signs with clearer messages (such as Bikes May/Allowed Use Of Full Lane and 3-foot overtaking signs) could be developed, tested, and implemented.
__________________
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
#8
Senior Member
Join Date: Jan 2006
Location: Atlantic Beach Florida
Posts: 1,946
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 3777 Post(s)
Liked 1,047 Times
in
791 Posts
I thought I'd help some to read RCMoeur's posts Yes, I had to look them all up
MUTCD
Manual on Uniform Traffic Control Devices
FHWA
Federal Highway Administration
NCUTCD
National Committee on Uniform Traffic Control Devices
ITE
Institute of Transportation Engineers
NACTO
National Association of City Transportation Officials.
MUTCD
Manual on Uniform Traffic Control Devices
FHWA
Federal Highway Administration
NCUTCD
National Committee on Uniform Traffic Control Devices
ITE
Institute of Transportation Engineers
NACTO
National Association of City Transportation Officials.
.
#10
Happy banana slug
Join Date: Sep 2015
Location: Arcata, California, U.S., North America, Earth, Saggitarius Arm, Milky Way
Posts: 3,696
Bikes: 1984 Araya MB 261, 1992 Specialized Rockhopper Sport, 1993 Hard Rock Ultra, 1994 Trek Multitrack 750, 1995 Trek Singletrack 930
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 1533 Post(s)
Liked 1,530 Times
in
917 Posts
I gather that folks in a lot of advocacy organizations are going through it; it's over 1,300 pages, so it'll take awhile before analyses start coming out.
In the good news/bad news pile, the new edition de-emphasizes the hated "85th percentile" rule, but it's still there.
In the good news/bad news pile, the new edition de-emphasizes the hated "85th percentile" rule, but it's still there.
#11
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
I gather that folks in a lot of advocacy organizations are going through it; it's over 1,300 pages, so it'll take awhile before analyses start coming out.
In the good news/bad news pile, the new edition de-emphasizes the hated "85th percentile" rule, but it's still there.
In the good news/bad news pile, the new edition de-emphasizes the hated "85th percentile" rule, but it's still there.
Many professionals are happy that FHWA has clarified that the MUTCD is not a design manual. It defines devices and specific treatments and sets out basic parameters on their use. Other references are much more thorough and useful for roadway design.
In my professional practice, the 85th percentile free-flow speed value is a very useful indicator for identifying the prevailing speed on a roadway. And if something about that roadway doesn't change substantially, it's very likely that speed will be the same in the future. Unfortunately, changing the numbers on signs doesn't really meaningfully change travel speeds.
One eventual Safe System goal is "self-explaining roads", where the roadway is designed and managed so that users choose and travel at an appropriate speed so there's a matchup of expectations between the desired and measured speed. National Cooperative Highway Research Program (NCHRP) Project 07-36 is working on this, and has issued a request for proposals for researchers to develop this project.
One useful current tool for setting posted speed limits is NCHRP Report 966, developed by several transportation research professionals with whom I've worked with through the years. There are others as well.
In the Final Rule and supporting documents, FHWA has stated that one possible action is to remove speed zoning guidance from the MUTCD entirely, and have the MUTCD focus on the definition and installation of speed signing, and let more-comprehensive references such as NCHRP Report 966 and others guide practitioners and agencies in determining appropriate posted speed limits. In its docket comments, NCUTCD supported such an action. We'll see if that is included in a future MUTCD revision.
__________________
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
#12
Senior Member
Join Date: Mar 2012
Location: Tallahassee, FL
Posts: 4,811
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 1591 Post(s)
Likes: 0
Liked 1,020 Times
in
572 Posts
I gather that folks in a lot of advocacy organizations are going through it; it's over 1,300 pages, so it'll take awhile before analyses start coming out.
In the good news/bad news pile, the new edition de-emphasizes the hated "85th percentile" rule, but it's still there.
In the good news/bad news pile, the new edition de-emphasizes the hated "85th percentile" rule, but it's still there.
#13
Been Around Awhile
Join Date: Oct 2004
Location: Burlington Iowa
Posts: 29,974
Bikes: Vaterland and Ragazzi
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked 1,536 Times
in
1,045 Posts
Hated by whom? My guess is that at least as based BF posts, high speed limits are "hated" by some urban dwellers who would advocate that ownership or access to private automobiles be limited to as few people as possible.
#14
Happy banana slug
Join Date: Sep 2015
Location: Arcata, California, U.S., North America, Earth, Saggitarius Arm, Milky Way
Posts: 3,696
Bikes: 1984 Araya MB 261, 1992 Specialized Rockhopper Sport, 1993 Hard Rock Ultra, 1994 Trek Multitrack 750, 1995 Trek Singletrack 930
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 1533 Post(s)
Liked 1,530 Times
in
917 Posts
Swiped from a Wikipedia footnote:
Minor, Nathaniel (September 15, 2023). "A lower speed limit could be coming to a Colorado road near you". Colorado Public Radio. Retrieved September 15, 2023. Traditionally, U.S. traffic engineers use the '85th percentile' method that sets limits at the speed at or below which 85 percent of drivers travel in normal conditions. This federally approved approach has been used by state and local transportation agencies since at least the '60s, but street safety advocates and city transportation officials deride the method because it usually leads to higher speed limits and faster speeds, which is associated with more serious crashes.
#15
Happy banana slug
Join Date: Sep 2015
Location: Arcata, California, U.S., North America, Earth, Saggitarius Arm, Milky Way
Posts: 3,696
Bikes: 1984 Araya MB 261, 1992 Specialized Rockhopper Sport, 1993 Hard Rock Ultra, 1994 Trek Multitrack 750, 1995 Trek Singletrack 930
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 1533 Post(s)
Liked 1,530 Times
in
917 Posts
@RCMoeur, I'm looking forward to seeing what NACTO has to say about it, as they're the ones who have do deal with it.
#16
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
One Wikipedia policy is reliance on "published works." This can result in activist web articles being given equal credibility as peer-reviewed journal articles.
As noted above, the 85th percentile free-flow speed is a useful piece of data. The disagreement seems to be in how it is used after it is assessed, typically in several areas:
1. Is the speed appropriate for the roadway and its context?
2. What speed is appropriate?
3. How do you achieve motor vehicle user compliance with that speed? And as experience has shown, declaring a road to have a certain speed limit and posting signs has not been effective in achieving this, unless the posted speed is already close to the 85th & in the pace. Gotta do (a lot of) something else to get the actual speeds to change, and more data is needed on effective strategies.
As noted above, the 85th percentile free-flow speed is a useful piece of data. The disagreement seems to be in how it is used after it is assessed, typically in several areas:
1. Is the speed appropriate for the roadway and its context?
2. What speed is appropriate?
3. How do you achieve motor vehicle user compliance with that speed? And as experience has shown, declaring a road to have a certain speed limit and posting signs has not been effective in achieving this, unless the posted speed is already close to the 85th & in the pace. Gotta do (a lot of) something else to get the actual speeds to change, and more data is needed on effective strategies.
__________________
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
#17
Cantilever believer
Thread Starter
Join Date: Nov 2021
Location: Phoenix, AZ
Posts: 1,565
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 536 Post(s)
Liked 1,839 Times
in
832 Posts
@RCMoeur, I'm looking forward to seeing what NACTO has to say about it, as they're the ones who have do deal with it.
NACTO is a member of NCUTCD, and has city agency staff on several technical committees.
#18
Senior Member
Join Date: Mar 2012
Location: Tallahassee, FL
Posts: 4,811
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 1591 Post(s)
Likes: 0
Liked 1,020 Times
in
572 Posts
3. How do you achieve motor vehicle user compliance with that speed? And as experience has shown, declaring a road to have a certain speed limit and posting signs has not been effective in achieving this, unless the posted speed is already close to the 85th & in the pace. Gotta do (a lot of) something else to get the actual speeds to change, and more data is needed on effective strategies.
I can't say I encounter many roads where the speed limit seems unreasonably high. I actually hadn't realized this was considered much of an issue. There are issues locally with residential streets that become heavily traveled due to development so the residents complain about people speeding down their road. But that's more an issue of roads unsuited for the volume and nature of traffic rather than a speed limit issue. Although the solution is generally speed bumps and islands.