00495519

Component

http://onlinepubs.trb.org...trr/1989/1249/1249-004.pdf

https://scholar.google.co...aneh&publication_year=1989

Industry-supplied data allowed a structured statistical comparison of the safety performance of tractor-semitrailers (singles) and doubles by comparing their accident experience on the same routes for 3 years. This paired structure essentially controls for roadway, environment and traffic conditions. Separate comparisons of vehicle safety performance were conducted for access- and non-access-controlled highways, local streets, and parking lots. In general, doubles experienced lower accident rates than singles in 1983 and 1985, but higher accident rates in 1984, which was a year of greatly expanding doubles operation. Doubles' accident rates are significantly lower than singles' accident rates for all types of operating environments over the entire period from 1983 to 1985. For the types of carriers represented in the data and for the conditions characterized by the routes in the sample, the consistent evidence is that doubles had better safety performance than singles except for the trnasition year 1984. The generalization derived from the study is that doubles are generally as safe or safer than singles, even when specifically controlling for roadway, traffic, and environmental conditions. This study was conducted on routes that are approved for doubles' operation. It is, therefore, not appropriate to extrapolate these findings to any specific route.

This paper appears in Transportation Research Record No. 1249, Truck Transportation and Safety Issues. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

00620474

Hertz, Robin; Zador, Paul L

p. 18-29

1989

Transportation Research Record

0-309-04971-7

Figures (1) ; References (13) ; Tables (6)

Alternatives analysis; Crash rates; Highway safety; Motor vehicles; Size; Statistical analysis; Tractor trailer combinations; Trucks

Vehicle configurations

Data and Information Technology; Highways; Motor Carriers; Safety and Human Factors; Vehicles and Equipment; I81: Accident Statistics; I91: Vehicle Design and Safety

TRIS, TRB

Jul 31 1990 12:00AM

• IMPACTS OF THE TRUCKING INDUSTRY DEREGULATION ON SHIPPERS' PREFERENCES
• METHODOLOGY FOR EVALUATION OF TRUCK WEIGHT REGULATION ENFORCEMENT PROGRAMS
• OPERATIONAL CONSIDERATIONS RELATING TO LONG TRUCKS IN URBAN AREAS
• USE OF TIME SERIES ANALYSIS TO FORECAST TRUCK ACCIDENTS