United States Department of Transportation
i
ADOT state-specific crash prediction models : an Arizona needs study.
-
2016-12-01
-
[PDF-4.89 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:The predictive method in the Highway Safety Manual (HSM) includes a safety performance function (SPF),
crash modification factors (CMFs), and a local calibration factor (C), if available. Two alternatives exist for
applying the HSM prediction methodology to local conditions. They are either calibration of the SPFs found in
the HSM or the development of jurisdiction-specific SPFs
The objective of this study was to develop a process to evaluate the SPFs contained in the HSM for road
segments and intersections on the Arizona State Highway System and to determine if those SPFs should be
calibrated or if Arizona-specific SPFs should be developed.
The recommendations are that ADOT move forward with SPF calibration for all HSM safety performance
functions as for project-level safety analysis in Arizona. A specific calibration function has been calculated for
two-lane rural undivided highways. Safety analysis is progressing at a promising rate and can be used to attain
significant reductions in fatal crashes and crash severity. To achieve this, ADOT will need to make a significant
commitment to developing and maintaining a comprehensive database of roadway characteristics combined
with crash data and average annual daily traffic volume data that are all linked through a common linear
referencing system.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
