00634561

Component

http://onlinepubs.trb.org...trr/1993/1385/1385-005.pdf

https://scholar.google.co...y+Jr&publication_year=1993

The current state of the practice of measures used to improve traffic safety at intersections on rural expressways is described. The description is based on the results of a recent survey of 49 state highway departments. In general, highway departments use their access control policy and a variety of safety improvement measures at locations with poor safety records to minimize accident potential. The access control policy typically specifies the justification for and frequency of access openings and median openings. Most states indicated that one access opening is provided per abutting parcel that cannot be served by other means. In contrast, median openings are typically provided only at intersections of the expressway and other public roads. Safety improvement measures identified by the survey respondents were categorized as either traffic control measures or geometric design measures. Seventy-four percent of the states indicated that they consider traffic signal control and flashing beacons for application at high-accident locations. Thirty percent of the states consider turn lane additions or modifications at high-accident locations. One modification of expressway left-turn lane design that appears to have particular merit is the offset left-turn bay. In this design, opposing left-turn bays on the expressway are laterally offset such that stopped vehicles in the bay do not block the sight lines of opposing left-turn vehicles.

This paper appears in Transportation Research Record No. 1385, Intersection and Interchange Design. 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

01403217

English

p. 41-47

1993

Transportation Research Record

0309054567

Figures (4) ; References (1) ; Tables (2)

Access control (Transportation); Beacons; Crossovers; Data collection; Expressways; Flashing beacons; Geometric design; High risk locations; Improvements; Intersections; Left turn lanes; Median openings; Medians; Offsets (Traffic signal timing); Rural highways; State departments of transportation; State of the art studies; Surveys; Traffic control; Traffic safety; Traffic signals; Turning lanes

Access control

Design; Highways; Operations and Traffic Management; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure; I82: Accidents and Transport Infrastructure

TRIS, TRB, ATRI

Aug 30 1993 12:00AM

• ACCESS CONTROL ISSUES RELATED TO URBAN ARTERIAL INTERSECTION DESIGN
• ACCIDENTS AND SAFETY ASSOCIATED WITH INTERCHANGES
• COMPARISON OF SIGHT DISTANCE PROCEDURES FOR TURNING VEHICLES FROM A STOP-CONTROLLED APPROACH
• COORDINATION OF BASIC INTERSECTION DESIGN ELEMENTS: AN OVERVIEW
• DESIGN OF INTERCHANGE AT-GRADE RAMP TERMINALS
• FREEWAY AND INTERCHANGE DESIGN: A HISTORICAL PERSPECTIVE
• GEOMETRIC DESIGN FEATURES OF SINGLE-POINT URBAN INTERCHANGES
• GEOMETRIC DESIGN OF METERED ENTRANCE AND HIGH-OCCUPANCY VEHICLE BYPASS RAMPS
• GRADE-SEPARATED INTERSECTIONS
• HUMAN FACTORS ASSOCIATED WITH INTERCHANGE DESIGN FEATURES
• INTERCHANGE PLANNING AND DESIGN--AN INTERNATIONAL PERSPECTIVE
• INTERCHANGE RAMP GEOMETRICS--ALIGNMENT AND SUPERELEVATION DESIGN
• INTERCHANGE STUDY AND SELECTION PROCESS
• INTERSECTION DESIGN CONSIDERATIONS TO ACCOMMODATE LARGE TRUCKS
• LENGTHS OF LEFT-TURN LANES AT SIGNALIZED INTERSECTIONS
• OPERATIONAL CONSIDERATIONS FOR SYSTEMS OF INTERCHANGES
• RAMP EXIT/ENTRANCE DESIGN--TAPER VERSUS PARALLEL AND CRITICAL DIMENSIONS
• RAMP/MAINLINE SPEED RELATIONSHIPS AND DESIGN CONSIDERATIONS
• SAFE ACCOMMODATION OF PEDESTRIANS AT INTERSECTIONS
• TWO-LANE LOOP RAMPS: OPERATION AND DESIGN CONSIDERATIONS