Highway Facilities for an Aging Arizona Population
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Summary
This report, prepared for the Arizona Department of Transportation (ADOT) in 2003, addresses the growing safety concerns associated with Arizona’s aging population. As the number of drivers aged 65 and older increases, so does their risk of collision and fatal injury due to age-related declines in vision, cognition, and physical function. The study aims to examine current highway design practices, analyze crash data for older drivers in Arizona, and survey older adults regarding their perceptions of roadway safety and needs. The research employed a three-part methodology: a comprehensive literature review of factors affecting older drivers and state-of-the-art design practices; an analysis of ADOT traffic records from 1999 to 2001 comparing drivers aged 65+ against younger cohorts; and a survey of older adults administered through senior centers in Maricopa County. The survey sought to identify specific difficulties older drivers face and their preferences for roadway enhancements and screening measures. The analysis of collision data revealed that older Arizona drivers are significantly more likely than younger drivers to be involved in angle and left-turn collisions, particularly at intersections and junctions, including signaled and unsignaled locations. These accidents frequently occur during daylight hours and in rural areas. Furthermore, older drivers suffer fatal injuries at higher rates than other age groups. The survey results indicated that older adults find driving at night, navigating freeways, and identifying street names to be the most difficult tasks. Respondents identified poor lettering on signs, inadequate intersection markings, and a lack of sidewalks as primary roadway deficiencies. They rated larger, better-illuminated traffic signs as the most helpful design improvement and supported special senior driver testing programs as the most effective screening option. Based on these findings, the report recommends that ADOT prioritize roadway improvements at high-frequency accident sites. Specific enhancements include modifying left-turn phase indicators, installing larger and better-illuminated signs, improving signage contrast and advance notification for complex maneuvers, and upgrading pedestrian crossing designs with increased timing and refuge islands. Additionally, the report advises ADOT to enhance driver screening and assessment protocols. Recommendations include implementing cognitive tests like the Trail Making protocol, utilizing tailored on-road driving tests for re-licensure, and establishing a system for medical professionals to report at-risk drivers. Finally, the authors suggest adopting low-cost education and self-testing initiatives to help older adults monitor their own driving performance.
Key finding
Older drivers in Arizona were significantly more likely than younger drivers to be involved in angle and left-turn collisions at intersections during daylight hours, and they rated larger, better-illuminated traffic signs as the most helpful design improvement.
Methodology
mixed_methods
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.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- older drivers
- older driver retraining
- age related perceptual decline
- pedal misapplication
- mci dementia driving
- rail grade crossings
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Empirical Findings: observational prevalence, crash risk outcomes
- Methodological Resource: dataset resource