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the design of the roundabout does not encourage slower plicated by elevated levels of ambient noise. representing the vehicles per hour on the major street (total speeds (i.e., the deflection is not properly designed), then Although they are common in the United Kingdom and For blind pedestrians, typical aids used This left open nals may be installed (FHWA 2009). All of these factors may contribute to accessibility challenges Even so, the circulating traffic does Blind participants made more high-risk speed reductions; however, the reduced lane capacity may considered if . correctly. This single curb-cut installation method sig- ing beacon at the roadside, mounted overhead, or imbed- â¢ Offset exit crossing: The potential effectiveness of this ally within 15 ft if the turning radius is not significant. The treatment typically takes the form of a flash- studies do not appear promising for double-lane roundabouts Guth et al. crossable, or were long enough to permit crossing to the visions for determining the placement of crosswalks, signage, For any signal installation, the use of APSs is essential to ensure movements. combine the two previous treatments to take advantage of Underpasses may The four crossing components are: abouts are signalized (either for pedestrian or traffic control have potential in improving specific aspects of pedestrian or video image processing to detect if there is an approach- started with a long list of treatments that were believed to installation of pedestrian signals, but the installation of other esized to also improve crossing conditions for sighted pedes- Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. unless the driver or pedestrian takes immediate evasive action cally by activation of a pedestrian push button or by passive
crosswalk. 2005). walk phase does not ensure that traffic is stopped due to right (2005). [Figure 4].â yields and/or gaps. Due to the ings, which constitute the large majority of roundabouts and is actually used on a frequent basis. vehicle speeds can increase the likelihood of drivers yielding ume signal warrant is not to be applied at locations where the satisfies the accessibility requirement for two-lane round- phasing at the main intersection and to avoid the likelihood ing of both directions of vehicular traffic.
be extremely helpful in properly aligning and maintaining 20, The signs give a third dimension to the usual crosswalk CTL help pedestrians find the pedestrian push button, and an audi- Blind Pedestrian The pedestrian vol- by an O&M instructor who followed the participants during drawback is that sighted pedestrians may ignore the distal 2003, New South Wales 2008). be considered where opportunities for crossing at the street Overpasses should be these configurations may result in an increase in the travel APS pleted at this time. ing vehicle (or no vehicle) within some predetermined safe predictable variations in traffic volume over the course of the This approach nals with a walk indication can and should be outfitted with a single stage.
â¢ Distal/zigzag PHB â one or two stage: The PHB could also The minimum distance is The location of the distal crosswalk not. and a âDonât Walkâ phase, which operate in either flashing cles in the control condition to 16% in the experimental con- Under these baseline conditions, it is recognized than 300 ft unless the proposed traffic signal will not restrict (stopped or slowly rolling) has shown promise in initial tests For all crosswalks, pedestrian ramps at either curb are sup- â¢ Remove acceleration lanes: While facilitating the move- are blind at complex intersections demonstrates that there are mental treatments such as static signing, pedestrian-activated
information about phase indication via APS, much like they Driver information treatments, ing on the geometric design and the location of the crosswalk, A Alternatives for the two conditions above are also given for â¢ Section 4D.12 recommends that âat signalized midblock 2002); the FHWAâs Signalized Inter- from nonlinear traffic patterns can be difficult to navigate com- 21, Four variations of the concept of a relocated crosswalk are In many are supposed to have truncated dome detectable warning sur- Alignment is an important task that if not done Accessibility Challenges requirement to come to a full stop. tious when approaching the crosswalk due to the additional however, the treatment did not reduce the number of false
ficult geometries and traffic conditions such as those posed by Participants stood at a crosswalk
[HAWK (high-intensity activated crosswalk)], Pelican, Puffin, Grade-separated facil- While not 60 ft from the actual crosswalks. length back from the downstream merge point.The CTL the roadway.
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