Oregon Regional Intelligent Transportation Systems (ITS) Integration Program Final Phase III Report: I-5/Barbur Boulevard Parallel Corridor Traffic Management Demonstration Project
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Summary
This report evaluates the I-5/Barbur Boulevard Parallel Corridor Traffic Management Demonstration Project, a cooperative initiative between the Oregon Department of Transportation (ODOT) and the City of Portland. The project aimed to integrate Intelligent Transportation Systems (ITS) along a high-volume freeway-arterial corridor south of downtown Portland to improve incident management, traveler mobility, and corridor efficiency. The primary motivation was to manage traffic diversion from Interstate 5 (I-5) to the parallel arterial, Barbur Boulevard, during incidents, thereby minimizing delay and maintaining throughput without expanding roadway capacity. The evaluation employed a mixed-methods approach comparing data from before and after the deployment of the integrated ITS system, which included variable message signs (VMSs), closed-circuit television cameras, ramp meters, and traffic signals. Customer satisfaction was assessed through panel surveys of northbound commuters during three specific incidents: one prior to deployment (Incident 1), one during deployment (Incident 2), and one after deployment (Incident 3). System efficiency and mobility were analyzed using traffic volume and speed data from I-5, as well as speed data from bus probes along Barbur Boulevard. The study tested hypotheses regarding improved corridor efficiency, reduced travel times, decreased accident risk, and enhanced customer satisfaction. The findings indicated that while customer satisfaction ratings for traffic conditions did not significantly improve statistically, reported commute times were shorter during the post-deployment incident (Incident 3) compared to the pre-deployment incident (Incident 1), despite Incident 3 being more severe. Commuters who utilized Barbur Boulevard as an alternate route reported significantly shorter additional commute times than those who remained on I-5. Mobility data confirmed that while I-5 experienced severe degradation in speed and capacity during incidents, Barbur Boulevard maintained speeds at 81 percent of normal or better. Furthermore, traffic on Barbur Boulevard recovered more quickly after the clearance of post-deployment incidents than after the pre-deployment incident, suggesting the incident management plan effectively moved traffic along the arterial. The study concluded that the ITS integration successfully improved traveler mobility by facilitating efficient diversion to Barbur Boulevard, supporting the hypothesis that the project reduces delay and travel times during incidents. However, the hypothesis regarding increased corridor efficiency was deemed inconclusive due to insufficient volume data on Barbur Boulevard, and the hypothesis regarding reduced accident risk could not be tested due to a lack of secondary incident data. The results suggest that integrated freeway-arterial management is effective at mitigating the impact of major freeway incidents on commuter travel times, though further data collection is required to confirm impacts on overall satisfaction and safety.
Key finding
Commuters who used Barbur Boulevard as an alternate route reported significantly shorter additional commute times than those who stayed on I-5, and Barbur Boulevard speeds recovered to normal levels faster after incident clearance than during pre-deployment incidents.
Methodology
mixed_methods
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 24 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Applied Guidance: countermeasure evaluation