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TECHBRIEF
This techbrief is an archived publication and may contain dated technical, contact, and link information
Publication Number:  FHWA-HRT-17-068    Date:  November 2017
Publication Number: FHWA-HRT-17-068
Date: November 2017

 

Safety Evaluation of Edge Line Rumble Stripes (ELRSs) on Rural, Two-Lane Horizontal Curves

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FHWA Publication No.: FHWA-HRT-17-068
FHWA Contact: Roya Amjadi, HRDS-20, (202) 493-3383, roya.amjadi@fhwa.dot.gov

This document is a technical summary of the Federal Highway Administration report Safety Evaluation of Edge Line Rumble Stripes (ELRSs) on Rural, Two-Lane Horizontal Curves (FHWA-HRT-17-069).

Objective

The Federal Highway Administration (FHWA) established the Development of Crash Modification Factors (DCMF) program in 2012 to address highway safety research needs for evaluating new and innovative safety strategies (improvements) by developing reliable quantitative estimates of their effectiveness in reducing crashes. The goal of the DCMF program is to save lives by identifying new safety strategies that effectively reduce crashes and promote those strategies for nationwide implementation by providing measures of their safety effectiveness and benefit–cost (B/C) ratios through research. State transportation departments and other transportation agencies need to have objective measures for safety effectiveness and B/C ratios before investing in new strategies for statewide safety improvements. Forty State transportation departments provide technical feedback on safety improvements to the DCMF program and implement new safety improvements to facilitate evaluations. These States are members of the Evaluation of Low-Cost Safety Improvements Pooled Fund Study, which functions under the DCMF program.

This study evaluated the application of edge line rumble stripes (ELRSs) on rural, two-lane horizontal curves. This strategy was intended to reduce the frequency of run-off-road (ROR) crashes and nighttime crashes by alerting drivers that they are about to leave the traveled lane and by enhancing visibility of the edge line during nighttime and wet-weather conditions.

Several research studies have examined the use of shoulder rumble strips (SRSs); however, research into the performance of ELRSs is rare and has not been rigorously evaluated. Additionally, milled rumble strips are installed on roadway segments, consisting of both horizontal tangents and horizontal curves. Installations on only horizontal curves are uncommon and, therefore, safety effectiveness evaluations have not focused on their effectiveness on horizontal curves specifically. This research focused on the safety effectiveness of ELRSs on rural, two-lane horizontal curves, taken from rumble stripe installations that are not specific to horizontal curves.

FHWA-HRT-17-068 PDF Cover Image

 

 

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