Wednesday, June 25, 2014

Improving the MUTCD by Proposing Language Modifications - Bicycle Detector Symbol Marking

The MUTCD is a document that is produced by the Federal Highway Administration. The National Committee on Uniform Traffic Control Devices simply offers proposed language that the FHWA considered prior to producing the final language in the document.

I volunteered to write my first Section, which was a fairly simple undertaking because the existing language in the MUTCD is two sentences. My proposed additions to provide green is shown below in green.

Section 9C.05 Bicycle Detector Symbol
Option:
01 A symbol (see Figure 9C-7) may be placed on the pavement indicating the optimum position for a bicyclist to actuate the signal.
02 An R10-22 sign (see Section 9B.13 and Figure 9B-2) may be installed to supplement the pavement marking.

Guidance:
A sample of what is proposed by the language. 
03 Green may be used in combination with the bicycle detector symbol where a light colored pavement does not provide sufficient contrast with the markings. 

UPDATE & proposed Edit to 3A.05 of MUTCD
05 When used, green pavement markings shall be used to delineate bicycle facilities:
A.     Increase the awareness of conflict areas at intersections and in separated bicycle facilities
B.      Provide contrast to shared lane markings, or


C.      Provide contrast to improve understanding and used in combination with the bicycle detector symbol where a light colored pavement does not provide sufficient contrast with the markings. 

The study that Portland State University completed on this treatment is linked here.

1 comment:

Ted Timmons said...

I like the non-green/non-boxed version better. It does a better job nudging a cyclist to line up properly. Perhaps another shape? Diamond?