IMPACTS OF FREEWAY SURVEILLANCE AND CONTROL ON EASTBOUND SR 520. FINAL REPORT

This project analyzed and evaluated the impacts of ramp metering and a new ramp HOV lane on eastbound SR520 which connects Seattle and the Eastside suburbs. Data analyzed included origin-destination surveys, manual vehicle occupancy counts, floating car travel-times, queue-length counts, electronic volume and lane-occupancy values, and bus travel-times. The results showed that the numbers of carpools and vanpools were significantly increased on the ramp with the new HOV lane and overall level-of-service was improved for mainline SR520. A significant number of trips were diverted from the local neighborhood to I-5. Queue-lengths and travel-times to the ramp mergers with the mainline increased significantly for both ramps. This was an expected result and had the desired effect of diverting trips from the neighborhood and increasing HOV ridership.

• Record URL:
  • http://www.wsdot.wa.gov/research/reports/fullreports/099.1.pdf
• 
• Corporate Authors:

  University of Washington, Seattle

  Seattle, WA  United States  98195

  Washington State Department of Transportation

  Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
  Olympia, WA  United States  98504-7300

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Nihan, N L
• Publication Date: 1987-2

Media Info

• Features: Appendices; Figures; References;
• Pagination: 84 p.

Subject/Index Terms

• TRT Terms: Bus lanes; Carpools; Freeway operations; High occupancy vehicle lanes; High occupancy vehicles; Interchange ramps; Lane occupancy; Origin and destination; Queuing; Ramp metering; Traffic lanes; Traffic volume; Transportation system management; Travel time; Vanpools; Vehicle occupancy
• Old TRIS Terms: Freeway ramps; Reserved lanes
• Subject Areas: Highways; Operations and Traffic Management; Public Transportation; I73: Traffic Control;

Filing Info

• Accession Number: 00472204
• Record Type: Publication
• Report/Paper Numbers: WA-RD-99.1
• Contract Numbers: Y2811, Task 22
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jul 31 1987 12:00AM