Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities (2011) / Chapter Skim
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Pages 13-23
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From page 13... ...
Under higher traffic volumes, pedestrians may wait on the splitter island until a crossable opportunity is detected on the second leg of the crossing. In either case, the pedestrian crossing task is typically focused to one direction at a time.
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From page 14... ...
designed to improve pedestrian safety and access. In essence, there are three typical locations for a pedestrian crosswalk associated with a CTL.
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vehicles, the blind pedestrian must wait until traffic is stopped or until there is no traffic approaching from either direction on the through street. The downstream crosswalk location creates different issues.
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Access Board is to develop design guidelines for transportation facilities, ensuring that public rights-of-way are accessible to and usable by all people and are thereby in compliance with the ADA. The Access Board published the draft Public Rights-of-Way Accessibility Guidelines (PROWAG, U.S.
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From page 17... ...
Pedestrian Signals Pedestrian crossing control devices can be grouped into two types: pedestrian displays and vehicle displays. Pedestrian displays in the United States typically feature a "Walk" and a "Don't Walk" phase, which operate in either flashing or solid state depending on the phase.
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From page 18... ...
18 Figure 4. Warrant 4, pedestrian peak hour (source: FHWA 2009)
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From page 19... ...
Overall, blind participants were about 2.5 times less likely to make correct judgments than sighted participants, took significantly longer to detect crossable gaps, and were more likely to miss crossable gaps altogether. Further, the errors of blind participants were much more likely to be high risk than the errors of sighted participants at the two roundabouts that carried moderate and high volumes of traffic, in contrast to data collected at the lower volume roundabout.
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Another important source of information is TCRP Report 112/NCHRP Report 562: Improving Pedestrian Safety at Unsignalized Crossings (Fitzpatrick et al.
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. The treatment can also have the added benefit of providing information on the availability of crossable gaps.
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From page 22... ...
Additionally, depending on signal timing and placements, vehicle queues can spill back on the roundabout exit from the signal to affect roundabout circulating flow or CTL through movements. However, APS-equipped signals can be effective at stopping traffic and at providing the pedestrian with visual and auditory cues of when the crossing phase is active.
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From page 23... ...
If a two-phase crossing is used, a median refuge island would be necessary. Depending on pedestrian route patterns, these configurations may result in an increase in the travel time for pedestrians compared to a crossing at the traditional splitter island.
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