INTEGRATING TRIP AND ROADWAY CHARACTERISTICS IN MANAGI1 NG SAFETY AT TRAFFIC ANALYSIS ZONES

摘要

A transportation network is a conglomeration of various sets of road-traffic-environment modules and isfeatured by multi-categories of inter-dependent factors. This makes the management of safety in TrafficAnalysis Zones (TAZs) explicitly challenging. This study aims at investigating the association betweencrash frequencies and various types of trip productions and attractions in combination with the roadcharacteristics of 1349 TAZs of four counties in the state of Florida. Crash safety management of theseTAZs is emphasized through prioritizing them by examining the effects of various trip and roadwayfactors on the aggregated crash frequencies. Models were developed separately for total crashes, severecrashes (fatal and severe injury crashes), total crashes during peak hours and pedestrian and bicyclerelated crashes taking various groups of estimators into considerations. It was found that total crash modeland peak hour crash model were best estimated by the total trip productions and total trip attractions.Severe crash model was best fit by the trip related variables only and pedestrian and bicycle related crashmodel was best fit by the road related variables only. The results from this study pave the way for bettersafety management and incorporating safety measures in travel and network planning.