00672525

Component

http://onlinepubs.trb.org...trr/1994/1446/1446-008.pdf

https://scholar.google.co...sman&publication_year=1994

To mitigate increasing traffic congestion and to improve highway safety, state departments of transportation have come up with some innovative strategies for optimizing the efficiency of congested freeway sections. Two such strategies are freeway-to-freeway ramp metering and mainline metering. Freeway-to-freeway ramp metering involves installing traffic signals (either on the side of the roadway or overhead) on the ramps found at freeway-to-freeway interchanges. Mainline metering involves installing traffic signals (usually overhead) on the mainline of a freeway. Some examples of freeway-to-freeway ramp metering in the United States, namely, in Minnesota and California, are examined and the advantages and disadvantages of freeway-to-freeway ramp metering are discussed. The implementation and operational issues of the only known operating example of mainline metering in the western United States are also discussed. A complete and thorough analysis should take place before the installation of any freeway-to-freeway or mainline metering system. This analysis is needed to ensure that safety is maintained and that environmental concerns are addressed. The suggested policy on freeway-to-freeway ramp metering is to install meters on freeway-to-freeway ramps where system performance and efficiency would be improved. The suggested policy on mainline metering is to install mainline meters on freeways approaching bottleneck locations where analysis indicates that improved traffic operations would result. Guidelines for both metering types are given.

This paper appears in Transportation Research Record No. 1446, High-Occupancy-Vehicle Systems and 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

01401274

English

p. 48-55

1994

Transportation Research Record

0309060524

Figures (8) ; References (2)

Bottlenecks; Case studies; Guidelines; Highway safety; Mainline metering; Policy; Ramp metering; Traffic congestion; Traffic mitigation

Mitigation

Washington (State)

Washington (State)

Highways; Operations and Traffic Management; Policy; I73: Traffic Control

TRIS, TRB

Jan 10 1995 12:00AM

• COMPARATIVE EVALUATION OF ADAPTIVE AND NEURAL-NETWORK EXIT DEMAND PREDICTION FOR FREEWAY CONTROL
• COORDINATING RAMP METER OPERATION WITH UPSTREAM INTERSECTION TRAFFIC SIGNAL
• EMERGENCY PARKING AREAS ALONG RESTRIPED URBAN FREEWAYS
• EVALUATION OF HIGH-OCCUPANCY-VEHICLE LANES IN PHOENIX, ARIZONA
• HIGH-OCCUPANCY-VEHICLE TREATMENTS ON TOLL FACILITIES
• HOV LANES AND RAMP METERING: CAN THEY WORK TOGETHER FOR AIR QUALITY?
• INTEGRATED REAL-TIME RAMP METERING MODEL FOR NONRECURRENT CONGESTION: FRAMEWORK AND PRELIMINARY RESULTS
• MARKETING A HIGH-OCCUPANCY-VEHICLE LANE IN A SUBURBAN SETTING: LONG ISLAND EXPRESSWAY EXPERIENCE
• PUBLIC ATTITUDES TOWARD CONVERSION OF MIXED-USE FREEWAY LANES TO HIGH-OCCUPANCY-VEHICLE LANES
• SURVEY OF EFFORTS TO EVALUATE FREEWAY SERVICE PATROLS
• USE OF INTEGRATION MODEL TO STUDY HIGH-OCCUPANCY-VEHICLE FACILITIES