Such a criterion recognises that the majority of motorists operate their vehicle in a reasonable and prudent manner with due consideration for conditions encountered, including activity into and out of intersecting public streets and approaches as well as the presence of pedestrians and bicyclists on or near the roadway.
By setting speed limits using the 85th percentile speed, the range of speeds is lessened, providing a more uniform flow of traffic. Studies have shown that:
- more collisions occur when the speeds of vehicles are varied with extremely high or low speeds encountered;
- setting speed limits lower than that considered reasonable to the majority of drivers encourages disrespect of speed limits in general;
- posted speed limits which are set higher or lower than that dictated by roadway and traffic conditions are ignored by the majority of motorists; and that
- when speed limits are raised or lowered, there is very little impact on motorists’ actual speeds.
Safe, “credible speed limits” can be expected to enhance motorists’ compliance to the speed limit, which in turn can result in a reduction in collisions than would otherwise be the case.
If a speed limit is not credible, motorists will be inclined to elect to drive at a speed that they perceive to be realistic. If speed limits are perceived as being incredible too frequently, it will challenge the public’s trust in the speed limit system generally. A speed limit can be incredible because the speed limit is either perceived as being too low or as being too high.
The net effect of incredible speed limits is that motorists will increasingly disregard that and consequently with frequent incredible limits, motorists will begin more and more disregarding road rules and regulations.
If it is noticed that drivers are disregarding speed and other regulations, it is often a symptom of the application of improper traffic engineering.
What is MUTCD?
The Manual on Uniform Traffic Control Devices (MUTCD) is a document of NATIONAL STANDARDS issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed, and used.
These specifications include the shapes, colours, and fonts used in road markings and signs and the specifications to apply signage.
In the United States, all traffic control devices must legally conform to these standards. The manual is used by state and local agencies as well as private construction firms to ensure that the traffic control devices they use conform to the national standard.
The National Committee on Uniform Traffic Control Devices (NCUTCD) advises the FHWA on additions, revisions, and changes to the MUTCD.
The NATIONAL STANDARD for Canada:
The Transportation Association of Canada (TAC) publishes its own Manual of Uniform Traffic Control Devices for Canada for use by Canadian jurisdictions.
While it is not compulsory for use, most jurisdictions adhere to the consistent application of traffic signage, road surface markings and signals design, installation and application in accordance with MUTCD. Consistent signage use is known to enhance safety and driver compliance with regulation.
Although it serves a similar role to the FHWA MUTCD, it has been independently developed and has a number of key differences with its US counterpart, most notably the inclusion of bilingual (English/French) signage for jurisdictions such as New Brunswick and Ontario with significant anglophone and francophone population, and a heavier reliance on symbols rather than text legends. There are jurisdictions that require compliance with MUTCD by law.
The first MUTCD was released in 1935.
Does the City of Winnipeg conform to Canada's MUTCD's National Standards?
WiseUpWinnipeg advocates for the application known and established engineering and signage standards.
We advocate that MUTCD
should be enacted into Provincial law
as a requirement for all cities and municipalities in Manitoba.
Consistency and sound traffic management practices contribute to SAFETY and efficient traffic flows.
CITY REMOVES SPEED SIGNS - CLICK