#02 - Cross Walk Discussion - Laserfiche WebLink

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36 some agencies may maintain and restripe crosswalks more often than other agencies included in the study sample. MARKED AND UNMARKED CROSSWALK COMPARISONS The results revealed that on two-lane roads, there were no significant differences in pedestrian crashes for marked and unmarked crosswalk sites. In other words, pedestrian safety on two-lane roads was not found to be different, whether the crosswalk was marked or unmarked. This conclusion is based on a sample size of 914 crossing sites on two-lane roads (out of 2,000 total sites). Specifically, binomial comparison of pedestrian crash rates were computed for marked and unmarked sites within subsets by ADT, median type, and number of lanes, as shown in figure 18. On multilane roads with ADT of 12,000 or less, there were also no differences in pedestrian crash rates between marked and unmarked sites. On multilane roads with no raised medians and ADTs greater than 12,000, sites with marked crosswalks had higher pedestrian crash rates than unmarked crossings. On multilane roads (roads with three to eight lanes) with raised medians and vehicle ADTs greater than 15,000, a significantly higher pedestrian crash rate was associated with marked crosswalk sites compared to unmarked sites. Best-fit curves for multilane undivided roads were produced for pedestrian crashes (per million pedestrian crossings) at marked and unmarked crosswalks as a function of vehicle volume (ADT), as shown in figure 19. The data points of figure 19 were obtained by aggregating sites into traffic volume categories. Since each marked crosswalk site and its matched comparison (unmarked) site usually had the same traffic volume, each traffic volume category usually contained the same number of marked and unmarked sites (there were a few exceptions). Pedestrian crash rates were computed based on total pedestrian crashes and total pedestrian crossings within each traffic volume category. In figure 19, these rates are plotted at the midpoints of the traffic volume categories. Smooth curves were then fit to the data points. Similar analyses were conducted for multilane divided roads. A final negative binomial model was also developed. The analysis for multilane undivided roads revealed that: • For traffic volumes (ADTs) of about 10,000 or less, pedestrian crash rates were about the same (i.e., less than 0.25 pedestrian crashes per million pedestrian crossings) between marked and unmarked crosswalks. • For ADTs greater than 10,000, the pedestrian crash rate for marked crosswalks became increasingly higher as the ADTs increased. The pedestrian crash rate at unmarked crossings increased only slightly as the ADTs increased.