Arkansas: Highway Safety Improvement Program 2021 Annual Report
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Summary
This document is the 2021 Annual Report for the Arkansas Highway Safety Improvement Program (HSIP), prepared by the Arkansas Department of Transportation (ARDOT) in compliance with federal requirements under 23 U.S.C. 148. The report details the state’s efforts to reduce fatalities and serious injuries on public roads through systematic planning, implementation, and evaluation of safety countermeasures. The HSIP process is structured around three core phases: planning, implementation, and evaluation, guided by the state’s Strategic Highway Safety Plan (SHSP). The methodology for identifying safety projects relies on data-driven network screening and crash analysis. ARDOT utilizes a network screening tool to rank corridors and intersections based on total and fatal/serious injury crash rates, prioritizing facilities according to safety conditions. High-risk locations undergo detailed engineering studies that examine crash types, contributing factors (roadway, human, vehicle, environmental), and collision patterns. Countermeasures are selected through both spot studies for specific hotspots and systemic studies that address broader risk factors across the highway network, such as median types or intersection skew angles. Project prioritization is determined by benefit-cost analysis, using Crash Modification Factors (CMFs) and economic appraisals adjusted for inflation and socio-economic factors. Coordination involves internal divisions (Design, Maintenance, Planning) and external partners, including the Federal Highway Administration, Arkansas State Police, and local governments. Key accomplishments during the 2021 fiscal year include the development of a Local Road Safety Program to assist local agencies, the initiation of a statewide pavement friction improvement study, and the advancement of a statewide guardrail upgrade project to meet MASH standards. ARDOT approved new rounds of cable median barrier installations to reduce cross-median crashes and standardized retroreflective signal backplates on all signal work projects. Systemic low-cost projects targeting unsignalized intersections, Y-type intersections, and shoulder rumble strips were also under development. Additionally, ARDOT completed the All Public Roads Linear Referencing System (ARNOLD), enabling crash data recording on all public roads rather than just the federal-aid system, and concluded technical assistance for developing a Roadway Safety Management System software tool. The report signifies ARDOT’s ongoing commitment to data-informed safety improvements and regulatory compliance. By integrating crash data from all public roads and employing rigorous economic appraisal methods, ARDOT aims to maximize the effectiveness of HSIP funds. The establishment of new programs for local roads and the update of the SHSP for 2022 indicate a strategic shift toward broader systemic safety management and enhanced coordination with local jurisdictions. The report serves as a comprehensive record of these administrative and infrastructural advancements, demonstrating progress toward the federal goal of significantly reducing highway fatalities and serious injuries.
Key finding
The report details the administrative framework and ongoing safety initiatives of the Arkansas HSIP for fiscal year 2021, focusing on systemic and spot improvements to reduce fatalities and serious injuries.
Methodology
dataset
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
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| 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 | — | — | 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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- Applied Guidance: countermeasure evaluation
- Empirical Findings: crash risk outcomes
- Methodological Resource: dataset resource