Evaluation of Connected Vehicle Applications on Mahan Corridor, Phase I
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Summary
This report evaluates the efficacy of Dedicated Short-Range Communication (DSRC) infrastructure in improving traffic efficiency and safety along the Mahan Corridor in Tallahassee, Florida. Motivated by the AASHTO SPaT Challenge, which urged infrastructure owners to deploy DSRC for broadcasting Signal Phase and Timing (SPaT) and Intersection Map (MAP) data, the project installed 31 Roadside Units (RSUs) at 22 signalized intersections. The study aimed to assess operational performance, safety potential, driver behavior, and the viability of emerging Cellular Vehicle-to-Everything (C-V2X) technologies. The research comprised four primary tasks. Task 1 conducted pre-treatment operational and safety analyses using crowdsourced data from HERE, BlueTOAD, and Waze, alongside historical crash records. Task 2 evaluated the technical performance of the DSRC system, including hardware durability, communication quality, and data fusion capabilities. Task 3 examined driver behavior and attitudes through an experimental study where participants rode in vehicles equipped with Onboard Units (OBUs) displaying SPaT/MAP information. Task 4 provided a qualitative review of C-V2X systems compared to DSRC for infrastructure-to-vehicle broadcasting. Findings from Task 1 indicated that corridor segments intersecting major highways experienced constrained operations during peak hours. Crash analysis identified specific collision types, such as angle and rear-end crashes, as amenable to mitigation via Connected Vehicle (CV) applications. Task 2 demonstrated that the DSRC infrastructure remained viable and operationally long-lasting four years post-installation, though it faced technical and resource challenges. The system successfully broadcast SPaT/MAP messages, enhancing situational awareness. Task 3 revealed that drivers held positive attitudes toward in-vehicle SPaT/MAP displays, particularly regarding countdowns to green light onset. However, participants expressed concern that countdowns to the end of green might encourage speeding to beat the light, potentially increasing crash risks. Task 4 concluded that while C-V2X offers scalability, its deployment requires further assessment of technology maturity, cost, and interoperability, noting that two-way communication infrastructure remains immature. The study concludes that local agencies can successfully host CV pilot projects, which offer public relations benefits and demonstrate technological advancements in mobility and safety. Success and longevity depend on empowering local agencies with the technical resources to manage equipment procurement, maintenance, and upgrades. The report recommends continued small-scale testing to gather metrics for evaluating performance measures and addressing operational challenges associated with emerging CV technologies.
Key finding
The DSRC-based SPaT/MAP broadcasting system proved operationally viable and durable over four years, with driver feedback indicating improved situational awareness despite concerns about potential speeding behaviors.
Methodology
field_study
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| 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 | — | — | 19 | 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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- Empirical Findings: observational prevalence
- Methodological Resource: dataset resource, tool software