Developing a congestion mitigation toolbox.
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Summary
This report details the development of “A Michigan Toolbox for Mitigating Congestion,” a comprehensive resource created by the Texas Transportation Institute (TTI) for the Michigan Department of Transportation (MDOT). The project was motivated by increasing traffic congestion in Michigan, driven by rising demand and lagging supply, and the need for state and local agencies to identify effective mitigation strategies and improve collaboration. The primary objective was to create a user-friendly desk reference and educational tool that identifies potential strategies, outlines implementation techniques, and provides data on success, barriers, and cost-effectiveness. The research methodology involved four main tasks. First, the team conducted a comprehensive literature review of over 700 documents and more than 20 existing congestion management plans and toolboxes to identify promising strategies. Second, they developed a preliminary list of 307 potential strategies, which was refined through consultation with MDOT staff. Third, the team administered a web-based survey to 369 metropolitan planning organizations (MPOs) nationwide to gather agency experiences regarding the success, ease of implementation, and barriers of 211 specific strategies. Fourth, the researchers reviewed congestion management processes and interviewed staff from four Michigan transportation management areas to capture local context. Additionally, the team reviewed available technical literature to compile benefit-cost ratios for individual strategies. The final Toolbox includes 47 selected congestion mitigation strategies, organized into supply/system management and demand management categories. For each strategy, the Toolbox provides a description, implementation techniques, data requirements, lessons learned, impacts, and contact resources. The national survey results highlighted the most implemented, successful, and difficult strategies to implement, while the Michigan-specific review identified keys to success and barriers within the state’s transportation management areas. The report also summarizes benefit-cost ratios found in literature to guide practitioners in selecting cost-effective projects. The significance of this work lies in providing a standardized, evidence-based resource for transportation practitioners and elected officials. The Toolbox aims to serve as a cornerstone for public discussion and strategizing, ensuring consistency across MDOT regions, metropolitan planning organizations, and local governments. By consolidating national best practices and local experiences, the report facilitates better-informed decision-making for congestion mitigation projects, ultimately aiming to provide physical benefits to users of Michigan’s roadway network.
Key finding
The research team identified 47 congestion mitigation strategies and compiled their associated benefit-cost ratios to create a standardized toolbox for the Michigan Department of Transportation.
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 |
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| 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