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Title:

Assessing the Predictability of Short Segment Crash Analysis in the State of South Carolina

Accession Number:

01764277

Record Type:

Component

Abstract:

The main objective of this research is to evaluate the predictability of a short segment peak search method with lengths of less than 0.1 miles for the statewide screening of midblock crash locations. Three different approaches (Based on Highway Safety Manual (HSM) Safety Performance Functions (SPFs) are used to evaluate the short segment method. These approaches include state-specific SPFs, Driveway SPFs (using only Average Annual Daily Traffic (AADT), and driveway SPFs with adjusted Crash Modification Factors (CMFs). Frequency-based identification of short segments stratified by six different roadway types (rural two-lane undivided *R2U), rural four-lane divided (R4D), urban two lane undivided (U2U), urban four-lane divided (U4D), urban 2+ two-way left-turn lane (U3T), and urban 4+ two-way left-turn lane (U5T)) has been compared with three SPF based screening methods to determine segments with the highest excess predicted average crash frequency. For short segment sites with highest crash frequencies (3 for U3T, U4D, and U2U; 4 for U5T and 2 for R4D and R2U), the comparison showed similar results (Top 90% agreement). Thus, should insufficient data be available to conclude SPFs, a frequency-based approach will likely identify the top sites. While this method works relatively well with top sites, the reliability of this method will wane with lower-ranked sites.

Supplemental Notes:

This paper was sponsored by TRB committee ACS20 Standing Committee on Safety Performance Analysis.

Report/Paper Numbers:

TRBAM-21-04402

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Iqbal, Adika Mammadrahimli
Sarasua, Wayne
Famili, Afshin
Ogle, Jennifer Harper
Davis, William J
Kumar, Devesh
Basnet, Saurabh Bikram
Adjei, Emmanuel

Pagination:

17p

Publication Date:

2021

Conference:

Transportation Research Board 100th Annual Meeting

Location: Washington DC, United States
Date: 2021-1-5 to 2021-1-29
Sponsors: Transportation Research Board; Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Identifier Terms:

Highway Safety Manual

Geographic Terms:

South Carolina

Subject Areas:

Highways; Planning and Forecasting; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-04402

Files:

TRIS, TRB, ATRI

Created Date:

Dec 23 2020 11:24AM