The Unsafe Driving Acts of Motorists in the Vicinity of Large Trucks
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Summary
This 1999 technical brief from the Federal Motor Carrier Safety Administration addresses the safety risks posed by passenger vehicle drivers in the vicinity of large trucks. Although the fatal crash rate for large trucks declined significantly during the 1980s, truck-involved crashes accounted for a disproportionate share of fatalities, with 86% of deaths occurring to occupants of other vehicles, pedestrians, or cyclists rather than truck occupants. The study was motivated by the need to identify specific Unsafe Driving Acts (UDAs)—behaviors contributing to collisions—to develop targeted countermeasures, training materials, and potential legislative changes to the Uniform Vehicle Code and Model Traffic Ordinance (UVCMTO). The research methodology combined statistical analysis, expert consultation, and systematic rating. Researchers analyzed 1995 data from the Fatality Analysis Reporting System (FARS) and reviewed collision investigation reports from seven states to identify primary collision factors. They conducted open-ended interviews with truck drivers, collision investigators, and government officials to identify specific UDAs. A panel of 21 subject matter experts then rated these behaviors using a structured instrument. Experts assigned values on two 10-point scales: one for danger (combining probability and severity of collision) and one for frequency of occurrence. Researchers calculated mean scores and standard deviations, noting high agreement on danger ratings but greater variance in frequency ratings. To prioritize interventions, the study created a "criticality" metric that combined mean danger and frequency scores with equal weight. The findings identified several key UDAs, including changing lanes abruptly, driving left of center, following too closely, unsafe passing, improper merging, and driving between large trucks. Experts identified motorists' unfamiliarity with the performance limitations of large trucks—specifically regarding acceleration, braking, visibility, and mass—as a primary contributing factor. In terms of pure danger, "Driving left of center or into opposing traffic" (9.67) and "Unsafe passing" (9.62) were rated highest. "Following too closely" was the most frequent UDA (8.05) but ranked 17th in danger. The criticality metric, which balanced both factors, placed "Driving inattentively" (e.g., reading, phone use, fatigue) at the top (16.67), followed by "Merging improperly" (16.43) and "Failure to stop for a stop sign or light" (16.24). The study concludes that public education and training are essential to address motorist unfamiliarity with truck limitations. Recommendations include developing training materials for truck drivers to recognize these UDAs, creating public information campaigns illustrating truck performance constraints, and training law enforcement to distinguish between illegal acts and unsafe but legal behaviors like driving in "No-Zones." Furthermore, the authors propose amending the UVCMTO to allow citations for unsafe driving practices near large trucks that are currently not violations, arguing that the severe consequences of such collisions warrant specific legal penalties.
Key finding
Driving inattentively was ranked as the most critical unsafe driving act due to its high combined score of danger and frequency, while following too closely was identified as the most frequent but less dangerous behavior.
Methodology
mixed_methods
Sample size: 21
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 |
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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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- Empirical Findings: crash risk outcomes, observational prevalence