00467857

Component

http://onlinepubs.trb.org...trr/1987/1114/1114-008.pdf

https://scholar.google.co...cCoy&publication_year=1987

With the release of the 1985 Highway Capacity Manual, a new procedure for analyzing signalized intersections has been introduced. One of the major differences between the 1965 and the 1985 manuals is in the area of left-turn capacity. A general methodology for the analysis of signalized intersections, particularly left-turn operations, is described in the 1985 Manual. Unfortunately, with regard to exclusive left-turn lanes with protected/permitted phasing, the sample calculations provided do not appear to explicitly follow the general methodology. Moreover, the sample calculations introduce many new concepts that are not included in the discussion of the methodology. Calculation 3 in Chapter 9 of the manual is reexamined in this paper. In particular, the left-turn lane groups with protected/permitted phasing are reanalyzed according to the general methodology, but issue is taken with some of the "new" concepts introduced within Calculation 3. On the basis of the findings reported in this paper, it appears that there is a need for some revision of Chapter 9 of the 1985 Highway Capacity Manual, particularly with regard to the analysis of left-turn lane groups with protected/permitted phasing.

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

01418073

Beagan, Daniel F

p. 74-85

1987

Transportation Research Record

0309044669

Figures (8) ; References (6) ; Tables (3)

Accuracy; Analysis; Calculation; Exclusive permissive phasing; Left turn lanes; Methodology; Signalized intersections; Traffic

Highway Capacity Manual

Computation; Traffic analysis

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB

Mar 31 1988 12:00AM

• A BEHAVIORAL APPROACH TO RISK ESTIMATION OF REAR-END COLLISIONS AT SIGNALIZED INTERSECTIONS
• A COMPARISON OF FORMULAE FOR PREDICTING RAIL-HIGHWAY CROSSING HAZARDS (ABRIDGMENT) (DISCUSSION AND CLOSURE)
• ACCIDENT CAUSATION ANALYSIS AT RAILROAD CROSSINGS PROTECTED BY GATES
• ANALYSIS OF RAILROAD-HIGHWAY CROSSING ACTIVE ADVANCE WARNING DEVICES
• CONVERSION FROM PERMISSIVE TO EXCLUSIVE/PERMISSIVE LEFT-TURN PHASING: A BEFORE-AND-AFTER EVALUATION (DISCUSSION AND CLOSURE)
• EFFECTS OF CHEVRONS, POST-MOUNTED DELINEATORS, AND RAISED PAVEMENT MARKERS ON DRIVER BEHAVIOR AT ROADWAY CURVES
• EFFECTS OF REDUCED SPEED LIMITS IN RAPIDLY DEVELOPING URBAN FRINGE AREAS (ABRIDGMENT)
• EVALUATION OF WIDE EDGELINES (DISCUSSION AND CLOSURE)
• EVIPAS: A COMPUTER MODEL FOR THE OPTIMAL DESIGN OF A VEHICLE-ACTUATED TRAFFIC SIGNAL
• HOW TO ESTIMATE THE SAFETY OF RAIL-HIGHWAY GRADE CROSSINGS AND THE SAFETY EFFECTS OF WARNING DEVICES
• IDENTIFICATION OF NEEDED TRAFFIC CONTROL DEVICE RESEARCH
• REGIONAL DIFFERENCES IN PREFERENCES FOR MEDIAN CROSSOVER SIGNING
• THE EFFECTIVENESS OF RAILROAD CONSTANT WARNING TIME SYSTEMS
• TRAFFIC OPERATIONS OF BASIC TRAFFIC-ACTUATED CONTROL SYSTEMS AT DIAMOND INTERCHANGES
• UTILIZATION AND TIMING OF SIGNAL CHANGE INTERVAL
• WEIGHT-SPECIFIC HIGHWAY SIGN EFFECTS ON HEAVY TRUCKS