Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16006
Title: Would relaxing speed limits aggravate safety? A case study of Hong Kong
Authors: Wong, SC
Sze, NN
Lo, HK
Hung, WT 
Loo, BPY
Keywords: Road safety
Speed limit
Accident counts
Before and after study
Treatment group
Comparison group
Issue Date: 2005
Publisher: Pergamon Press
Source: Accident analysis and prevention, 2005, v. 37, no. 2, p. 377-388 How to cite?
Journal: Accident analysis and prevention 
Abstract: This paper studies the effect of the changed speed limits on accident counts for major roadways in the urban environment of Hong Kong. In 1999-2002, the speed limits of a number of sections of roadway were reviewed and increased. Nineteen of them were major roadways. Their speed limits were raised by 10-20km/h from 50 to 70km/h. Before and after studies were carried out to investigate the changes in accident counts with respect to the set of carefully chosen comparison groups. Qualification tests for these comparison groups were conducted to confirm their suitability for the studies. In the majority of the treatment sites, the accident counts were worse after the increase in speed limits, both for the category of fatal, serious and slight (FSS) accidents, and for the category of fatal and serious (FS) accidents. Overall, the relaxation of the speed limit from 50 to 70 km/h increased the FSS accident counts by 15% and the FS accident counts by 1%. The relaxation of the speed limit from 70 to 80 km/h increased the FSS accident counts by 18% and the FS accident counts by 36%.
URI: http://hdl.handle.net/10397/16006
ISSN: 0001-4575
DOI: 10.1016/j.aap.2004.09.008
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