Phase 1: Coordination of Freeway Ramp Meters and Arterial Traffic Signals Field Operational Test (FOT)

The objective of this project was to develop a practical strategy between one freeway ramp meter and one arterial intersection traffic signal and conduct a field operational test.  The project team successfully accomplished all proposed tasks.  The project started with literature review, ConOps development, algorithm, site selection, and systematic data collection.  The collected data was then used to calibrate a microscopic traffic system modeling using Aimsun, which is used to simulate the field operation test before deployment.  After getting positive results in the simulation, the algorithms were then deployed in the field.  The ramp meter 2070 controller running URMS (Universal Ramp Metering System) and the signal 2070 controller were linked and then coordinated.  Traffic data before and after the deployment were collected and analyzed.  The test data analysis showed a net delay reduction at the test intersection by 7%.  The analysis also showed a better use of the entrance ramp storage with higher entrance flow to the entrance ramp while avoiding queue overspill.  In addition, the analysis found that the freeway mainline traffic conditions immediately upstream of the entrance ramp remain undisturbed by such coordination.   This was not a natural conclusion out of this research.  Due to the success of the coordination between one intersection and one ramp meter, it may be worthwhile to coordinate a freeway corridor and relevant arterial intersections.  

Presentations

Project Final Report

Coordination of Freeway Ramp Meters and Arterial Traffic Signals - Field Operational Test (FOT)