Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook (2017) / Chapter Skim
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10 C H A P T E R 3 General Principles for Pedestrian Wayfinding and Crossing Tasks This chapter presents an overview of the design principles related to accessibility for pedestrians who are blind (subsequently referred to in this document as "blind pedestrians") that should be considered when designing a roundabout or CTL.
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General Principles for Pedestrian Wayfinding and Crossing Tasks 11 Figure 3-1. Pedestrian initiating crossing outside the crosswalk and toward a roundabout circulatory roadway.
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12 Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook Figure 3-3. Pedestrian walking on a splitter island rather than in a cut-through crosswalk.
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General Principles for Pedestrian Wayfinding and Crossing Tasks 13 3.1.2 Typical Wayfinding Techniques and Strategies 3.1.2.1 Determining the Appropriate Crossing Location In current practice, pedestrians who are blind and approaching an intersecting street with the intent to cross and continue in their current direction of travel, often assume there will be a crosswalk that is at least as wide as the width of the sidewalk on which they are approaching. They also assume that they are within the width of the crosswalk as they approach (Jacobson, 2013; LaGrow and Long, 2011)
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14 Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook Figure 3-5. Detectable landscape separation at roundabout.
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General Principles for Pedestrian Wayfinding and Crossing Tasks 15 Figure 3-7. Sidewalk separation at a roundabout not detectable under foot or by the use of a long cane.
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16 Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook approaches an intersection; instead, it is usually some distance around a large-radius corner and to one's side. At roundabouts, there typically is no traffic traveling parallel to the crosswalk.
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General Principles for Pedestrian Wayfinding and Crossing Tasks 17 An accessible pedestrian signal or other treatment with audible message may serve as a far side audible beacon if present to help with maintaining heading. But for most crossings at CTLs and roundabouts, the accuracy of the initial alignment is likely to have a strong impact on the direction of travel, with limited audible or tactile cues available to correct initial alignment errors while crossing.
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18 Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook 3.2 Crossing Tasks 3.2.1 Issues and Principles for Determining When to Cross The task of determining the appropriate or safe time to cross the street is a key concern for the accessibility of roundabout and CTL crossings by individuals who are blind. The crossing task is a key focus, given that this task is likely to be the most risky of the four wayfinding and crossing tasks (i.e., determining crossing location, aligning to cross, determining when to cross, and maintaining the correct heading while crossing)
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General Principles for Pedestrian Wayfinding and Crossing Tasks 19 of the street beside them, using that surge of traffic to indicate that the traffic parallel to their path has a green indication. They listen for traffic turning from the street beside them into the cross street across the crosswalk, since they know that many drivers do not yield to pedestrians, although pedestrians have the right-of-way.
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20 Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook the inability of most clients to make eye contact with the driver, leading to difficulty in discerning the driver's intentions and confirming that the driver is stopping for the pedestrian. It is not always clear whether the driver has indeed stopped to allow a pedestrian to cross or for some other reason, such as a stopped vehicle ahead.
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