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Title:

Safety Performance Functions for Low-Volume Roads

Accession Number:

01338066

Record Type:

Component

Abstract:

This paper analyzes roadway safety conditions using the network approach for a number of Italian roadways within the Province of Salerno. These roadways are characterized by low-volume conditions with a traffic flow of under 1,000 vehicles per day and they are situated partly on flat/rolling terrain covering 231.98 kilometers and partly on mountainous terrain for 751.60 kilometers. Since 2003, the Department of Transportation Engineering at the University of Naples has been conducting a large-scale research program based on crash data collected in Southern Italy. The research-study presented here has been used to calibrate crash prediction models (CPMs) per kilometer per year. The coefficients of the CPMs are estimated using a non-linear multi-variable regression analysis utilizing the least – square method. In conclusion, two injurious crash prediction models were performed for two-lane rural roads located on flat/rolling area with a vertical grade of less than 6 percent and on mountainous terrain with a vertical grade of more than 6 percent. A residuals analysis was subsequently developed to assess the adjusted coefficient of determination and p-value for each assessable coefficient of the prediction model. CPMs are a useful tool for estimating the expected number of crashes occurring within the roads’ geometric components (intersections and road sections) as a function of infrastructural, environmental, and roadway features. Several procedures exist in the scientific literature to predict the number of crashes per kilometer per year. CPMs can also be used as a tool for safety improvement project prioritization.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-0085

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Dell'Acqua, Gianluca
Russo, Francesca

Pagination:

19p3

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (3) ; Photos (2) ; References (19) ; Tables (3)

Uncontrolled Terms:

Transportation infrastructure

Geographic Terms:

Italy; Salerno (Italy)

Subject Areas:

Highways; Safety and Human Factors; I80: Accident Studies; I81: Accident Statistics

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-0085

Files:

TRIS, TRB

Created Date:

Feb 17 2011 5:19PM