00153159

Component

http://onlinepubs.trb.org...s/trr/1976/601/601-009.pdf

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

The objective of this paper is to enlarge the applicability of a hazard index model developed in earlier research so that it may be used for predicting the effectiveness of roadside safety improvements on all classes of highways. Data was collected for the purpose of estimating roadside encroachment rates, encroachment angle distributions, lateral displacement distributions, and obstacle severity indexes for all classes of highway other than freeways: urban arterial streets, rural two-lane highways, and multilane surface highways. The roadside obstacle severity index in the proportion of total accidents that are either fatal, or nonfatal injury accidents. The major premise is that, as operating speeds increase, the severity index of a particular roadside obstacle increases. A roadside encroachment occurs when a vehicle leaves the traveled way either because of loss of driver control or because of an emergency manoeuver to avoid collision with another vehicle. The parameters that describe the nature of these encroachments are the encroachment rate, distribution of encroachment angles, and distribtuion of lateral displacement of encroaching vehicles. Applying the developed roadside encroachment parameter estimates in the hazard model suggests that relatively little effectiveness can be gained by implementing roadside safety improvements on highways other than freeways.

Publication of this paper sponsored by Committee on Operational Effects of Geometrics. 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.

01411456

p. 51-52

1976

Transportation Research Record

0309025702

Digital/other

References (3) ; Tables (1)

Drivers; Fatalities; Highway safety; Injuries; Motor vehicles; Right of way (Land); Roadside; Speed; Traffic speed

Highways; Operations and Traffic Management; Safety and Human Factors

TRIS, TRB

May 31 1977 12:00AM

• AN APPROACH FOR MAXIMIZING THE CAPACITY OF SELF-SERVICE PARKING FACILITIES
• CHARACTERISTICS OF INTERSECTION ACCIDENTS IN RURAL MUNICIPALITIES (ABRIDGMENT)
• COST EFFECTIVENESS OF FREEWAY COURTESY PATROLS IN HOUSTON
• DEVELOPMENTS IN AUTOMATIC VEHICLE IDENTIFICATION DURING 1974 AND 1975
• EFFECT OF BRIDGE SHOULDER WIDTH ON TRAFFIC OPERATIONAL CHARACTERISTICS (ABRIDGMENT)
• EFFECT OF COMMERCIAL VEHICLES ON DELAY AT INTERSECTIONS
• EFFECT OF GUARDRAILS ON INTERSTATE BRIDGES ON VEHICLE SPEED AND LATERAL PLACEMENT (ABRIDGMENT)
• EFFECT OF THE ENERGY CRISIS ON EXISTING DESIGN STANDARDS
• EVALUATION OF FACTORS INFLUENCING DRIVEWAY ACCIDENTS
• FRAMEWORK FOR DESIGN AND OPERATION OF PASSING ZONES ON TWO- LANE HIGHWAYS
• HIGHWAY ACCIDENTS AT BRIDGES (ABRIDGMENT)
• OPERATING PARAMETERS FOR MAIN LINE SENSORS IN FREEWAY SURVEILLANCE SYSTEMS
• PLANNING TRANSIT FACILITY PARKING FOR THE BOSTON METROPOLITAN AREA
• ROADSIDE HAZARDS ON NONFREEWAY FACILITIES (ABRIDGMENT)
• SINGLE POINT DIVERSION OF FREEWAY TRAFFIC
• URBAN FREEWAY CORRIDOR CONTROL MODEL (ABRIDGMENT)