A comprehensive study on pavement edge line implementation.

Sun, Xiaoduan; Das, Subasish; University of Louisiana at Lafayette. Dept. of Civil and Environmental Engineering

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A comprehensive study on pavement edge line implementation.

2014-04-01
By Sun, Xiaoduan ; Das, Subasish

[PDF-294.36 KB]

English

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Details:

Creators:

Sun, Xiaoduan ; Das, Subasish

Sun, Xiaoduan ; Das, Subasish Less -
Corporate Creators:

University of Louisiana at Lafayette. Dept. of Civil and Environmental Engineering
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Collisions Edge Lines Highway Safety Pavements Road Markings Traffic Control Devices Traffic Safety
Publication/ Report Number:

FHWA/LA.13/508
Resource Type:

Tech Report
Geographical Coverage:

Louisiana
Corporate Publisher:

Louisiana. Dept. of Transportation and Development
Abstract:

The previous 2011 study “Safety Improvement from Edge Lines on Rural Two-Lane Highways” analyzed the crash data of

three years before and one year after edge line implementation by using the latest safety analysis statistical method. It

concluded that placing pavement edge lines on rural two-lane highways in Louisiana can not only change the lateral

positions of the vehicles but also reduce crashes. The Crash Modification Factor (CMF) for edge line on narrow, rural two-lane highways is 0.78. Considering the decreasing trend in crashes in the state for the past three years, the modified CMF is

0.83, which implies that, on average, implementing edge lines can reduce 17% of crashes.

As an extension of the 2011 project, this study not only used two more years of crash data for the after time period but also

applied the Empirical Bayes (EB) method in the analysis to estimate the crash reduction factors. Moreover, crash

characteristics analysis is performed in this study to compare the difference before and after edge line implementation.

Additionally, this project performed benefit and cost analysis.

By considering the safety trend in Louisiana, the final estimated CMF is 0.85, which means there is a 15% expected crash

reduction in edge line implementation on narrow, rural two-lane highways. The statistically estimated standard deviation for

the CMF is 0.039. The crash reduction is consistent in all crash types and particularly significant in single vehicle crashes.

Most of single vehicle crashes are ROR crashes, which is the exact type of crash targeted by edge line implementation.

The benefits overwhelmingly offset the cost with edge line implementation. The most conservative estimation for benefit

and cost ratio is 19.

This project recommends the use of edge lines on narrow rural two-lane highways whenever it is financially feasible and

operationally feasible.
Format:

PDF
Funding:

LTRC Project Number: 13-2P ; SIO Number: 30000730

LTRC Project Number: 13-2P ; SIO Number: 30000730 Less -
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:14ebab3aa156016398b002e34cc09bdd4295c30879c2ca4217f3e18a3a8d5e7c
Download URL:

https://rosap.ntl.bts.gov/view/dot/27322/dot_27322_DS1.pdf
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A comprehensive study on pavement edge line implementation.

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