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Data Needs for Tree Removal Crash Modification Factors on Arizona State Highways
| 题名： | Data Needs for Tree Removal Crash Modification Factors on Arizona State Highways |
| 作者： | Wemple, E.; Monsere, C. |
| 关键词： | Estimating crash modification factor##Arizona (State)##Tree removal##Arizona State highways##Roadway characteristics##Roads and highway##Data collection process##traffic volume##Safety practices##Implementation plan##Safety effectiveness##Safety studies##Arizona Department of Transportation (ADOT)##Roadway Departure Safety Implementation Plan (RDSIP)## |
| 摘要： | The Arizona Department of Transportation (ADOT) Roadway Departure Safety Implementation Plan (RDSIP) has identified tree removal as a feasible countermeasure to reduce roadway departure crash frequency or severity. Previous ADOT work has identified locations for tree removal, and activities to conduct this work are underway. To test the safety effectiveness of removing the trees, ADOT intends to conduct statistically rigorous before?after safety effectiveness analysis to estimate state?specific crash modification factors (CMFs). This report provides a seven?step data collection process, identifies and describes data needs, and recommends analytical methods for estimating the CMFs. The data needed for the analysis relate to crash type and severity, roadway characteristics, traffic volume, and tree removal. To complete the analysis, ADOT will compile the data before and after tree removal as outlined in this report and subsequently conduct the statistical analysis. The study team estimates that compiling, organizing, and managing the before?after period database could be completed over the course of a month before and after tree removal has been completed. The statistical analyses may take approximately two months to conduct. This level of effort is an estimate and does not assume full?time activity. In addition, the project analysis will not be conducted until three years after the tree removal has been completed at all sites. |
| 总页数： | 52 |
| 报告类型： | 科技报告 |
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