00157803

Component

http://onlinepubs.trb.org...s/trr/1976/609/609-006.pdf

http://scholar.google.com...nter&publication_year=1976

A study is described which was designed to determine if specific treatments on a section of a (NC-55) 2-lane rural roadway could extend the halo effect (the effect on driver behaviour beyond the point and time when enforcement is applied or when an enforcement symbol is observed). The study was done simultaneously with a study to evaluate a visual speed indicator (VSI) sign. The initial evaluation of the VSI was to determine whether the sign display would alter driver speed characteristics without police enforcement. The details of enforcement techniques, data collection and analysis techniques are outlined, and the results are presented. It was found that the use of a speed enforcement scene, a speed check zone, or a patrol vehicle produces substantial and significant reductions in mean, median, and 85th percentile speeds in the vicinity. All 3 enforcement techniques significantly reduce the percentage of vehicles travelling faster than 88.5 km/h (55 mph), as well as reduce the speed of all vehicles to the point of increasing the percentage of vehicles travelling slower than 72.4 km/h (45 mph). It was found that the VSI sign has no significant effect, and that the helo effect began to disappear 1,000 ft. past the enforcement treatment point and was completely gone at a point 2 miles downstream.

Publication of this paper sponsored by Committee on Traffic Law Enforcement. 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.

01411462

pp 31-33

1976

Transportation Research Record

0309025842

Digital/other

Figures (1) ; References (4)

Detectors; Drivers; Human characteristics; Motor vehicles; Police traffic services; Speed; Speed control; Speed indicators; Studies; Traffic law enforcement; Traffic signals; Traffic signs; Traffic speed; Two lane highways

Driver characteristics

Highways; Operations and Traffic Management; Safety and Human Factors; Society

TRIS, TRB

Sep 28 1977 12:00AM

• ADMINISTRATIVE ADJUDICATION OF DRIVING - WHILE - INTOXICATED OFFENSES
• ANALYSIS OF THE RELATION OF ACCIDENTS AND THE 88-KM/H (55-MPH) SPEED LIMIT ON ARIZONA HIGHWAYS (ABRIDGEMENT)
• ECONOMIC ANALYSIS OF ALCOHOL SAFETY COUNTERMEASURES
• EVALUATION OF ALCOHOLISM TREATMENT PROGRAMS FOR DRINKING DRIVERS
• ROADWAY ENVIRONMENT SUBSYSTEM OF THE HIGHWAY TRAFFIC RECORDS SYSTEM (ABRIDGEMENT)
• STUDIES OF ROADSIDE HAZARDS FOR PROJECTING FATAL CRASH SITES