00771209

Component

https://doi.org/10.3141/1665-05

http://scholar.google.com...fith&publication_year=1999

Single-vehicle run-off-the-road crashes result in about one-third of all highway fatalities and one-half million people injured annually, with a societal cost of $80 billion each year. Continuous shoulder rumble strips (CSRS) are one countermeasure used to address this significant safety problem. Data were analyzed for two states (California and Illinois) from the Highway Safety Information System to estimate the safety effects of CSRS on freeways. Before-and-after evaluations of CSRS projects with the use of different comparison groups were conducted. The results from the evaluations indicate that on average CSRS reduce single-vehicle run-off-the-road crashes by 18.3% on all freeways (without regard to urban/rural classification) and by 21.1% on rural freeways. Two types of potential adverse effects related to safety with CSRS were analyzed. The first type pertains to the crash risk that CSRS may present because of driver startle/panic responses. The second potential adverse effect of CSRS is crash migration. The research findings indicate that these potential adverse effects are insignificant.

This paper appears in Transportation Research Record No. 1665, Statistical Methods in Transportation and Safety Data Analysis for Highway Geometry, Design, and Operations.

English

p. 28-34

1999

Transportation Research Record

0309070651

Figures (2) ; References (10) ; Tables (2)

Before and after studies; Countermeasures; Freeways; Ran off road crashes; Road shoulders; Rumble strips; Rural highways; Safety; Single vehicle crashes; Urban highways

California; Illinois

Design; Highways; Safety and Human Factors; I82: Accidents and Transport Infrastructure

TRIS, TRB, ATRI

Oct 21 1999 12:00AM

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