Citation

McCoy PT, Malone MS. Transp. Res. Rec. 1989; 1239: 17-22.

Copyright

(Copyright © 1989, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

As part of research conducted to develop a more definitive guide for the selection of divided and undivided sections on urban four-lane roadways in Nebraska, accident experience at signalized and unsignalized intersections on urban four-lane roadways was analyzed to assess the safety effects of left-turn lanes.

RESULTS of this analysis are presented. Multivehicle accidents on intersection approaches with left-turn lanes were compared with those on similar approaches without left-turn lanes. The degree to which left-turn lanes on signalized and on uncontrolled approaches reduced accidents was computed. The statistical significance of the percent reductions was determined using the chi-squared test. Left-turn lanes at intersections on urban four-lane roadways were found to significantly reduce rear-end, sideswipe, and left-turn accidents. However, on the uncontrolled approaches of intersections on urban undivided roadways, left-turn lanes were found to significantly increase right-angle accidents, as well as reduce rear-end, sideswipe, and left-turn accidents.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1989/1239/1239-003.pdf

Language: en

Keywords

Roads and Streets; Highway Accidents--Analysis; Highway Engineering--Accident Prevention