Safety effectiveness of intersection left- and right-turn lanes / D. W. Harwood [and seven others].

Format:

Book

Government document

Author/Creator:

Harwood, Douglas W., author.

Contributor:

Midwest Research Institute (Kansas City, Mo.)

United States. Federal Highway Administration. Office of Safety R&D, sponsoring corporate body.

United States. Federal Highway Administration, issuing body.

Language:

English

Subjects (All):

Turning lanes.

Roads--Interchanges and intersections--Safety measures.

Roads.

Genre:

Online resources.

Physical Description:

1 online resource ([254] pages) : illustrations

Place of Publication:

[Washington, D.C.] : U.S. Department of Transportation, Federal Highway Administration, July 2002.

Summary:

This report presents the results of research that performed a well-designed before-after evaluation of the safety effects of providing left- and right-turn lanes for at-grade intersections. Geometric design, traffic control, traffic volume, and traffic accident data were gathered for a total of 280 improved intersections, as well as 300 similar intersections that were not improved during the study period. The types of improvement projects evaluated included installation of added left-turn lanes, added right-turn lanes, and extension of the length of existing left- or right-turn lanes. An observational before-after evaluation of these projects was performed using several alternative evaluation approaches. The three contrasting approaches to before-after evaluation used were the yoked comparison or matched-pair approach, the comparison group approach, and the Empirical Bayes approach. The research not only evaluated the safety effectiveness of left- and right-turn lane improvements, but also compared the performance of these three alternative approaches in making such evaluations. The research developed quantitative safety effectiveness measures for installation design improvements involving added left-turn lanes and added right-turn lanes. The research concluded that the Empirical Bayes method provided the most accurate and reliable results. Further use of this method is recommended.

Notes:

Description based on online resource; title from PDF cover (FHWA.DOT.gov website, viewed July 02, 2018).

"July 2002."

"Report no. FHWA-RD-02-089"--Technical report documentation page.

"Performing organization: Midwest Research Institute"--Technical report documentation page.

Includes tables and appendixes.

Includes bibliographical references (pages 157-163).

Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2011.

Other Format:

Print version: Harwood, Douglas W. Safety effectiveness of intersection left- and right-turn lanes

OCLC:

946286978

Access Restriction:

Use copy Restrictions unspecified