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Intelligent Transportation Systems (ITS) Statewide Evaluations

KAI is currently assisting the Oregon Department of Transportation (ODOT) with evaluation of nine innovative state-wide Intelligent Transportation Systems (ITS) projects. The scope of ITS implementations includes adaptive (SCATS and InSync) and responsive signal systems, variable message signs, innovative towing techniques, and Computer Aided Dispatch (CAD) Interconnect. KAI’s role is to evaluate traffic conditions such as delay and travel times/speeds using Bluetooth technology and video, queue lengths, emergency vehicle response times, and crashes before and after implementation of the various ITS systems. KAI is also investigating maintenance requirements and user perception of traffic conditions with and without ITS implementation.

ITS evaluations have been completed for the projects listed below. Please click on the heading of each project to open the final report/memorandum.


Delta Highway Queue Warning System Evaluation

ODOT along with local partners developed the first active queue warning system in the state of Oregon at a common crash location along Delta Highway near the Beltline Highway interchange in Eugene. 16 months of before and after spatial crash data was analyzed, and those crashes most likely to be associated with back of queue dropped from 11 to 7, or a 36% reduction in reported crashes. The queue warning system is believed to have played a major role in this statistically significant crash reduction.

Beltline Highway Ramp Metering

ODOT implemented the first ramp metering treatment outside the Portland metropolitan area along the Beltline Highway in Eugene. The implementation of ramp metering appears to have contributed to the 35% reduction in reported crashes, without a significant change to travel times along the corridor. Interestingly the travel time reliability improved for the eastbound direction, while getting slightly worse for the westbound direction in the before/after analysis. Additional comparisons of the third party probe data travel time and reliability results are recommended.

I5/I-405 Innovative Towing Evaluation

This study sought to test the effectiveness of three tow truck response strategies in terms of arrival time, influence on secondary crashes, and effects on traffic conditions. This study was designed as a before/after study to evaluate the staged and instant dispatch strategies against the typical strategy. Pilot tests of the staged and instant dispatch programs were conducted to determine their impacts on incident response, safety, and traffic conditions.

Tualatin-Sherwood Road SCATS Evaluation

The purpose of this technical memorandum is to present a comparison of operations between the previously optimized time-of-day (TOD) signal timing plans and the Sydney Coordinated Adaptive Traffic System (SCATS) adaptive signal system operation on Tualatin-Sherwood Road and Nyberg Road in Tualatin, Oregon.

US 97/OR 126 SCATS Evaluation

The purpose of this technical memorandum is to present a comparison of operations between the previously existing signal timing plans. These plans included both uncoordinated US 97 (Voyage and Wapiti firmware) signals and coordinated signals on OR 126 (Wapiti firmware) and the SCATS adaptive signal system operations on US 97 and OR 126 in Bend and Redmond, Oregon during typical conditions and during the Deschutes County Fair.

Cornell Road InSync Evaluation

The purpose of this technical memorandum is to present a comparison of operations between the previously optimized TOD operation signal timing plans and the InSync adaptive signal system operation on Cornell Road in Hillsboro, Oregon.

OR 99W Voyage Advanced Features Evaluation

The purpose of this technical memorandum is to present a comparison of operations between the previously optimized TOD signal timing plans and the Voyage Traffic Controller Software Advanced Features on OR 99W in Tigard, Oregon.

Powell Boulevard SCATS Evaluation

The purpose of this technical memorandum is to present a comparison of operations between the previously optimized TOD signal timing plans and the SCATS adaptive signal system operations on Powell Boulevard in Portland, Oregon.

911 CAD Integrated Dispatch Project

ODOT, Deschutes County 911, and Oregon State Police teamed up to develop and implement an integrated dispatch system for Deschutes County, Oregon. KAI led the interviews and technical evaluation of the resultant before/after performance metrics. The integrated system resulted in 25% faster dispatch response, 30% faster incident response, and almost 40% reduction in incident duration due to better information being shared faster between the agencies.