00315063

Component

http://onlinepubs.trb.org...s/trr/1979/737/737-003.pdf

https://scholar.google.co...lack&publication_year=1979

This paper describes a new detector-controller configuration intended to minimize the dilemma-zone problem at signalized intersections on high-speed roads. Included are a complete functional and electrical description of the design, the findings of a field test, and a comparison with two existing designs. The new design uses a basic, actuated, digital controller operated in the nonlocking mode. An approach that has a design speed of 89 km.h (55 mph) has an upstream detection loop located 117 m (384 ft) back from the intersection and a middle loop 77 m (254 ft) back. A loop at the stopline is 8 m (25 ft) in length and is connected to a novel extended-call--delayed-call (EC-DC) detector that is able to change from an EC model to a DC unit at the strategic moment during the green interval. In effect, the change disconnects the stopline loop, leaving the other two loops to control the extension and termination of the green. The controller and detectors are off-the-shelf units that require no internal modification. The only special-logic items are two relays mounted on the back panel. The design does not pose a maintenance problem. A test installation in Georgia significantly reduced conflicts associated with the dilemma zone. A comparison with two existing designs shows that the EC-DC configuration costs somewhat more than the EC design but is superior in three operational categories. It is less expensive than the density design and is superior in four operational aspects. (Author)

Publication of this paper sponsored by Committee on Traffic Control Devices. 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

00387801

HS-029 513

pp 17-23

1979

Transportation Research Record

0309029929

Print

Figures (8) ; Maps (1) ; Photos (7) ; References (4) ; Tables (2)

Digital computers; High speed ground transportation; High speed vehicles; Loop detectors; Signalized intersections; Speed; Traffic signal controllers

Highways; Operations and Traffic Management; Railroads

HSL, TRIS, TRB

Oct 8 1984 12:00AM

• ACCIDENT AND OPERATIONAL GUIDELINES FOR CONTINUOUS TWO-WAY LEFT-TURN MEDIAN LANES (DISCUSSION AND CLOSURE)
• BENEFIT-COST ANALYSIS OF ADVANCE TREATMENT FOR NO-PASSING ZONES (ABRIDGEMENT)
• DISCOMFORT GLARE: A REVIEW OF SOME RESEARCH (ABRIDGEMENT)
• DRIVER PERFORMANCE WITH RIGHT-SIDE CONVEX MIRRORS (DISCUSSION AND CLOSURE)
• ECONOMIC MODELS FOR HIGHWAY AND STREET ILLUMINATION DESIGNS
• FEASIBILITY STUDY OF ROUTE GUIDANCE SYSTEM
• FORMATION AND DISSIPATION OF TRAFFIC QUEUES: SOME MACROSCOPIC CONSIDERATIONS (ABRIDGEMENT)
• GUIDELINES FOR TRAFFIC CONTROL AT ISOLATED INTERSECTIONS ON HIGH-SPEED RURAL HIGHWAYS
• HIGHWAY GUIDE SIGNS: A FRAMEWORK FOR DESIGN AND EVALUATION
• HUMAN FACTORS CONSIDERATIONS FOR IN-VEHICLE ROUTE GUIDANCE
• MAINTENANCE COSTS OF TRAFFIC SIGNALS
• MODERN ROTARIES: A TRANSPORTATION SYSTEMS MANAGEMENT ALTERNATIVE (DISCUSSION AND CLOSURE)
• OUTLINE OF THE COMPREHENSIVE AUTOMOBILE TRAFFIC CONTROL PILOT TEST SYSTEM
• PAVEMENT INSET LIGHTS FOR USE DURING FOG (ABRIDGEMENT)
• REFLECTORIZATION OF RAILROAD ROLLING STOCK (DISCUSSION AND CLOSURE)
• SHOULDER IMPROVEMENTS ON TWO-LANE ROADS (ABRIDGEMENT)
• TEST OF 400-W HIGH-PRESSURE SODIUM VAPOR LIGHTING (ABRIDGEMENT)
• WARRANTS FOR LEFT-TURN SIGNAL PHASING