Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments (2017) / Chapter Skim
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13 C H A P T E R 3 Site Identification The NCHRP Project 17-56 research team used multiple methods for identifying cities and states that had installed pedestrian crossing treatments at unsignalized intersections: • Identifying agencies using the team's experience and knowledge from managing the Walk Friendly Communities program; • Contacting pedestrian coordinators at state and local agencies to request lists of specific sites or suggestions for jurisdictions to contact; • Soliciting agencies through the Association of Pedestrian and Bicycle Professionals (APBP) listserv; • Communicating with other research teams involved in ongoing projects related to pedestrian safety treatments; • Contacting vendors to obtain indications of cities with specific treatments; • Making personal telephone calls to selected agencies known or suspected to have treatments of interest; and • Conducting exploratory field work to identify specific treatment and comparison sites in multiple cities across the United States, including Portland, Oregon; Tucson, Arizona; and Miami, Florida.
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14 Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments • Priority 3 -- these cities were unlikely to be included in the study since they have low numbers of potential treatment sites and would add little benefit (additional treatment installations) for the cost (logistics of incorporating another agency into the data collection process)
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Data Collection 15 Category Data Elements Treatment Description of countermeasure Treatment Before condition (baseline) Treatment Midblock vs.
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16 Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments had the most comparison sites (112) , primarily because of the availability of a large sample of unsignalized crossings with existing 12-hour pedestrian counts.
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Data Collection 17 that have advanced YIELD or STOP markings and signs plus refuge islands. There are 53 sites that have three treatment types: either RRFBs or PHBs in combination with advanced YIELD or STOP markings and signs and refuge islands.
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18 Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments Appendix A provides descriptions and examples of treatment installations. Samples of pedestrian counts and site photographs are given in Appendix B
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Data Collection 19 crosswalks were found at about 100 crossing sites. Multiple crosswalk types (80 sites)
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20 Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments City State Treatment Sites Comparison Sites Total Number of Sites Intersection Midblock Total Number of Sites Intersection Midblock Alexandria VA 3 3 100% 0 0% 2 1 50% 1 50% Arlington VA 20 17 85% 3 15% 20 16 80% 4 20% Cambridge MA 19 17 89% 2 11% 25 21 84% 4 16% Charlotte NC 36 20 56% 16 44% 112 82 73% 30 27% Chicago IL 36 28 78% 8 22% 37 30 81% 7 19% Eugene OR 29 16 55% 13 45% 27 22 81% 5 19% Miami FL 30 19 63% 11 37% 36 27 75% 9 25% Milwaukee WI 12 10 83% 2 17% 18 16 89% 2 11% New York NY 17 11 65% 6 35% 24 20 83% 4 17% Phoenix AZ 18 12 67% 6 33% 16 11 69% 5 31% Portland OR 61 53 87% 8 13% 33 21 64% 12 36% Scottsdale AZ 18 11 61% 7 39% 16 8 50% 8 50% St. Petersburg FL 115 78 68% 37 32% 45 29 64% 16 36% Tucson AZ 85 81 95% 4 5% 65 60 92% 5 8% Total 499 376 75% 123 25% 476 364 76% 112 24% Table 3-5.
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Data Collection 21 Approach The data collection followed a consistent and pre-established process for collecting pedestrian counts. Several key steps are the following: 1.
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22 Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments Summary In summary, pedestrian volumes were collected at a total of 491 treatment sites and 424 comparison sites in 14 cities from July through November 2014. The pedestrian counts were used to estimate the pedestrian AADT for each of these sites.
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Data Collection 23 narratives of each crash could not be used to locate the crashes relative to the treatment(s) of interest.
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