United States Department of Transportation
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners.
As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
i
Data needs for tree removal crash modification factors on Arizona state highways.
-
2016-07-01
[PDF-2.19 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract: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.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
