00469575

Component

http://onlinepubs.trb.org...trr/1987/1132/1132-006.pdf

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

The FREQ8PL freeway simulation model was used to aid in the evaluation of the feasibility of a proposed exclusive bus-high-occupancy-vehicle priority lane treatment on New Jersey Route 495 between the New Jersey Turnpike and the Lincoln Tunnel. The input data, assumptions, and usefulness of the model in assessing impacts of alternative treatments are described. The model was used as an aid in the evaluation of three possible configurations of an exclusive lane. The simulation results indicated the importance of maximum utilization of bottleneck sections. They also indicated the importance of beginning the priority lane before the start of queues of nonpriority vehicles. The simulations revealed a significant limitation of the FREQ8PL model: it cannot account for reduced processing capability at on ramps blocked by standing mainline queues. To remedy this, an external spreadsheet-based procedure for adjusting ramp volumes was developed. This external procedure was also needed to supplement the queue length and travel time information reported by FREQ8PL to obtain estimates of queue lengths and delay times on blocked ramps. Probable shifts in route of travel in response to the priority lane implementation were also estimated external to the FREQ8PL model, because of limitations in the model's ability to estimate such shifts. A lower level-of-service F speed-flow curve than that presented in the current Highway Capacity Manual was developed to replicate the dense, slow-moving queues observed on this freeway during peak periods. The spreadsheet program was also used to create several useful graphics displaying projected travel times and queue lengths.

Publication of this paper sponsored by Committee on Freeway Operations. 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

01418148

pp 42-52

1987

Transportation Research Record

0309045096

Print

Figures (11) ; References (6) ; Tables (1)

Alternatives analysis; Bottlenecks; Bus lanes; Bus priority; Feasibility analysis; Freeways; High occupancy vehicle lanes; High occupancy vehicles; Impact studies; Interchange ramps; Queuing; Traffic delays; Traffic lanes; Traffic signal preemption; Traffic simulation; Travel time

New Jersey

New Jersey

Highways; Operations and Traffic Management; Public Transportation; I73: Traffic Control

TRIS, TRB

Jul 31 1988 12:00AM

• A METHODOLOGY FOR QUANTIFYING URBAN FREEWAY CONGESTION
• A PROCEDURE FOR THE ASSESSMENT OF TRAFFIC IMPACTS DURING FREEWAY RECONSTRUCTION
• A REVIEW OF CANDIDATE FREEWAY-ARTERIAL CORRIDOR TRAFFIC MODELS
• ANALYSIS OF FREEWAY RECONSTRUCTION ALTERNATIVES USING TRAFFIC SIMULATION
• COMMUTER PERCEPTIONS OF TRAFFIC CONGESTION DURING THE RECONSTRUCTION OF I-45 NORTH FREEWAY IN HOUSTON
• DELAY ANALYSIS FOR FREEWAY CORRIDOR SURVEILLANCE, COMMUNICATION, AND CONTROL SYSTEMS
• FREEWAY OPERATIONS AND THE CUSP CATASTROPHE: AN EMPIRICAL ANALYSIS
• FREEWAY SIMULATION MODELS REVISITED
• MITIGATING CORRIDOR TRAVEL IMPACTS DURING RECONSTRUCTION: AN OVERVIEW OF LITERATURE, EXPERIENCES, AND CURRENT RESEARCH
• TRAFFIC DETECTOR ERRORS AND DIAGNOSTICS