TRAFFIC SIGNAL TIMING MODELS FOR OVERSATURATED SIGNALIZED INTERCHANGES. INTERIM REPORT
This research report documents the development models for control of signalized diamond interchanges during oversaturated traffic conditions. Oversaturated traffic conditions occur when the average traffic demand exceeds the capacity of the signal system. The dynamic optimization model proposed is the principal product of this research. The control objective of the dynamic model is to provide maximum system productivity as well as minimum delay for a selected roadway system. A special feature predetermined upper limits. The dynamic model was developed for conventional diamond interchanges and three-level diamond interchanges. The model takes the form of mixed integer linear programming. The effectiveness of the control strategies generated by the dynamic model was compared to those derived from conventional signal timing models, using the TRAF-NETSIM microscopic simulation model. It was found that the dynamic models produced optimal signal timing plans for the oversaturated signalized interchanges. The dynamic model consistently outperformed conventional models with respect to system productivity. This conclusion was drawn from the TRAF-NETSIM simulation. The dynamic model solutions significantly reduced total system delay for most test cases, while slightly increasing the delay for a few test cases.
- Research study title: Guidelines for Operational Control of Diamond Interchange.
Arlington, TX United States 76011
Austin, TX United States 78763
Washington, DC United States 20590
- Kim, Y
- Messer, C J
- Publication Date: 1992-1
- Features: Appendices; Figures; References; Tables;
- Pagination: 118 p.
- TRT Terms: Diamond interchanges; Interchanges; Linear programming; Mathematical models; Measures of effectiveness; Microsimulation; Optimization; Oversaturation (Traffic flow); Signalized intersections; Simulation; Traffic congestion; Traffic delays; Traffic signal timing
- Uncontrolled Terms: Effectiveness; Models
- Old TRIS Terms: Signalized interchanges
- Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;
- Accession Number: 00622333
- Record Type: Publication
- Report/Paper Numbers: FHWA/TX-92/1148-2, Res Rept 1148-2, TTI: 2-18-88-1148
- Contract Numbers: Study 2-18-88-1148
- Files: TRIS, USDOT, STATEDOT
- Created Date: May 31 1992 12:00AM