TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Proposed Modification Factors for Roadside Slopes
Cover of Proposed Modification Factors for Roadside Slopes

Accession Number:

01626694

Record Type:

Component

Abstract:

Vehicle rollovers comprise twenty-eight percent of the roadway departure fatalities, representing the largest percentage of any roadway departure crash category. Understanding the probability of rollover can lead to crash prevention and is the initial action toward reducing rollover crashes. This study captured the effect of foreslope on rollover probability. The effect of foreslope width, encroachment speed and angle, and highway type were also studied to ascertain the influence each of these has on rollover outcome and crash severity. Crash modification factors were developed for use in the Highway Safety Manual’s Roadside Model and trajectory adjustment factors were developed for incorporation into the AASHTO Roadside Design Guide’s third version of the Roadside Safety Analysis Program. More than 200,000 rollover and non-rollover events in the state of Washington between 2002 and 2007 and Ohio between 2002 and 2010 were studied alongside 1,440 computer simulated Manual for Assessing Safety Hardware (MASH) small car trajectories. This paper documents the collection, processing and assessment of these data sources and the results obtained. This research led to an improved understanding of the influence of slopes on rollover outcome and severity. It was found that a vehicle is approximately nine times more likely to rollover on a -2H:1V slope than a -10H:1V slope. It was also found that the crash severity is twice as high in a run-off-road terrain event when the vehicles rollovers over as compared to not rolling over.

Supplemental Notes:

This paper was sponsored by TRB committee AFB20 Standing Committee on Roadside Safety Design.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-01039

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Carrigan, Christine E
Sheikh, Nauman M

Pagination:

14p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Geographic Terms:

Ohio; Washington (State)

Subject Areas:

Design; Highways; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-01039

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Dec 8 2016 10:17AM