Citation

Elvik R. Accid. Anal. Prev. 2017; 99: 364-371.

Affiliation

Institute of Transport Economics, Gaustadalleen 21, 0349 Oslo, Norway. Electronic address: re@toi.no.

Copyright

(Copyright © 2017, Elsevier Publishing)

DOI

10.1016/j.aap.2016.12.018

PMID

28064101

Abstract

This paper presents a meta-analysis of the road safety effects of converting junctions to roundabouts. 44 studies containing a total of 154 estimates of effect were included. Based on a meta-regression analysis, converting junctions to roundabouts is associated with a reduction of fatal accidents of about 65% and a reduction of injury accidents of about 40%. The mean effect on property-damage-only accidents is ambiguous. Summary estimates of effect are robust for fatal and injury accidents, but vary depending on the model of meta-analysis and the treatment of outlying data points for property-damage-only accidents. A trim-and-fill analysis suggests a weak tendency for publication bias, with modest influence on summary estimates of effect. It is concluded that roundabouts are very effective in reducing traffic fatalities.

Copyright © 2016 Elsevier Ltd. All rights reserved.

Language: en