Dynamic Signal Priority Control Strategy to Mitigate Off-Ramp Queue Spillback to Freeway Mainline Segment

Congestion downstream of a freeway off-ramp often produces a traffic queue at the mainline and thus reduces the freeway capacity at the interchange area. To prevent such queue spillback, a proposed real-time control strategy provides a priority signal control to the off-ramp traffic when potential queue spillback is detected. Two priority strategies—unconditional and conditional controls—that quickly discharge the queuing vehicles on the off-ramp can contend with different congestion patterns at the freeway and local arterial. Based on field data from a freeway interchange in Zhubei, Taiwan, extensive simulation experiments demonstrate the effectiveness of the proposed strategies in preventing off-ramp queue spillbacks. The results show that the overall network performance can be significantly improved with the proposed strategy, even though some roadway segments of the local arterial network may experience negative impacts.

• Record URL:
  https://doi.org/10.3141/2438-01
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/172186.aspx
• Authors:
  • Yang, Xianfeng
  • Lu, Yang (Carl)
  • Chang, Gang-Len
• Publication Date: 2014

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 1–11
• Monograph Title: Traffic Signal Systems 2014, Volume 1
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2438
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Adaptive control; Freeway operations; Network analysis (Planning); Off ramps; Traffic congestion; Traffic queuing; Traffic signal priority; Traffic simulation
• Geographic Terms: Taiwan
• Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 01520128
• Record Type: Publication
• ISBN: 9780309295352
• Report/Paper Numbers: 14-0419
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Mar 26 2014 10:13AM