00153163

Component

http://onlinepubs.trb.org...s/trr/1976/601/601-014.pdf

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

A before and after field study was carried out to evaluate the effects of providing full width shoulders across long-span bridge structures as a means of improving traffic and safety. This study was carried out in two major stages. The first stage consisted of studying the effect of various bridge shoulder curb widths on the operational characteristics of vehicles on the bridge. The second stage consisted of making these same studies on the effects of various bridge shoulder curb widths with a guardrail type of barrier flush with the face of the curb and offset 2 ft. from the face of the curb. The following conclusions were reached after the results of the study were evaluated: Vehicle speed and placement data may be combined for different days of the week without any major loss of information; Relative location had a significant effect on speeds as the vehicles moved through the test sections; All curb conditions had a significant effect on vehicular speeds; There is significant interaction between positions and conditions and conditions for vehicle placements; Vehicles travel farther from the roadway edge at the center of the bridge under all curbing conditions; Vehicles travel farther from the shoulder at the center and the upstream and downstream ends of the bridge; With the 6 ft. curb, vehicles tend to move slightly away from the shoulder edge as they cross the bridge, then tend to overcorrect, and move nearer the shoulder downstream of the bridge.

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

pp 73-75

1976

Transportation Research Record

0309025702

Digital/other

Before and after studies; Bridges; Curbs; Highway operations; Motor vehicles; Road shoulders; Safety; Speed; Traffic; Traffic speed; Width

Bridges and other structures; 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 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 ENCROACHMENT PARAMETERS FOR NONFREEWAY FACILITIES (ABRIDGMENT)
• ROADSIDE HAZARDS ON NONFREEWAY FACILITIES (ABRIDGMENT)
• SINGLE POINT DIVERSION OF FREEWAY TRAFFIC
• URBAN FREEWAY CORRIDOR CONTROL MODEL (ABRIDGMENT)