Guidelines for Timing Yellow and All-Red Intervals at Signalized Intersections (2012) / Chapter Skim
Currently Skimming:
Pages 44-51
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 44... ...
44 This chapter presents the authors' assessment of the findings of this study. Through the literature review, the survey of state and local agency practices, and the field data results, the authors provide rationale for the proposed guideline for timing of yellow change and red clearance intervals, which is found in Appendix A
|
From page 45... ...
45 yellow law, following the language of the national Uniform Vehicle Code (16)
|
From page 46... ...
46 is recommended to consider the mean or median value when selecting a reaction time and deceleration rate for timing the yellow change interval. Consequently, the authors propose that a 10 ft/s2 deceleration rate be used in the kinematic equation.
|
From page 47... ...
47 vehicles will be exposed to or create potential conflict longer than faster traveling vehicles and therefore would require more red clearance time. However, applying the lower speed threshold would be overly conservative and inappropriate.
|
From page 48... ...
48 Although a pedestrian is legally obligated to yield the rightof-way to a vehicle lawfully in the intersection, engineers maintain that a factor of safety should be considered to completely clear any conflicting vehicles and eliminate the possibility of pedestrian-vehicle conflict. Pedestrians, like drivers, exhibit a start-up delay when reacting to the change of a pedestrian signal indication from DON'T WALK to WALK.
|
From page 49... ...
49 Is the Red Clearance Interval Necessary? According to the current edition of the MUTCD (1)
|
From page 50... ...
50 Since the provision of a red clearance interval is considered a safety factor, one would assume that there is evidence that the provision of a red clearance interval reduces the occurrence of angle crashes. A priori, one would expect a reduction in right-angle crashes at signalized intersections where the red clearance interval is used.
|
From page 51... ...
51 their travels, within and outside of their jurisdiction. This would pertain to the timing of the yellow change and red clearance intervals.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.