The RHODES-ITMS Corridor Control project addresses real-time control of ramp meters of a freeway segment, with consideration of the traffic volumes entering and leaving the freeway from/to arterials, and the regulation of these volumes via real-time setting of ramp metering rates.

RHODES is a traffic-adaptive signal control system that optimally controls the traffic that is observed in real time. The RHODES-ITMS Program is the application of the RHODES strategy for the two intersections of a freeway-arterial diamond interchange. This report addresses the latest phase of the RHODES-ITMS Program that resulted in a field test in the City of Tempe, Arizona. In summary, this phase involved: (i) the integration of the RHODES logic within the signal controller; (ii) the validation of the RHODES logic using "hardware-in-the-loop" simulation; (iii) the integration of the RHODES algorithms within Tempe's traffic management system; (iv) the deployment of RHODES for the field test; and (v) the data gathering and evaluation of traffic performance "with" and "without" the RHODES logic

This report documents the work performed and the results obtained on the RHODES - Integrated Traffic Management System (ITMS) Project. The project addressed the design and development of a real-time traffic adaptive control system for Freeway-Arterial Diamond Interchanges using the concepts underlying the RHODES traffic-adaptive signal control system. The traffic "controls" at a diamond interchange are the two sets of traffic signals located at the arterials, on both sides of the freeway, and the ramp meters at the on-ramps to the freeway. The RHODES-ITMS strategy considers, in real-time, the vehicle arrivals and the queues at the intersections and the on-ramps to optimally set these signals, also in real time, to decrease the overall delay of all the vehicles which use the arterials, the frontage roads parallel to the freeway (if they exist) and the ramps at the interchange

The RHODES-Integrated Traffic Management System Program addresses the design and development of a real-time traffic adaptive control system for an integrated system of freeways and arterial roads. The goals of this project were to test coordinated, adaptive ramp metering using the Multi-Objective, Integrated, Large-Scale, and Optimized System (MILOS) software on a major urban freeway. A 7-mile eastbound segment of I-10 in Phoenix, just west of the I-10/I-17 Interchange, was chosen as the study area because of the availability of data, and because of recurring congestion.