The Effects of Truck Size on Driver Behavior
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Abstract
This report discusses the effects of truck size on the behavior of drivers who interact with trucks in selected roadway situations. Specifically, truck length/configuration was addressed in a freeway entrance merge, mainline lane change, and narrow bridge situations while truck width was studied in a rural two-lane, two-way passing situation. Field work involved the collection of microscopic traffic measures via the Traffic Evaluator System in addition to observations of erratic maneuvers and truck type for the length/configuration studies. Length/configuration had little or no effect on interacting drivers as judged from the data available. The truck/width passing study employed an impedance factor to induce passing of an experimentally widened vehicle. Increasing truck width was found to be conducive to increased prepass headways, reduced lateral distance between passers (overtaking and oncoming) and the truck, and reduced lateral distance between oncomers and the road edge. However, no increases in shoulder encroachments by passers or acceptances of small gaps were found.
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 | — | — | 4 | 2026-05-23 |
| archive | success | — | — | — | 2 | 2026-05-23 |
| extract | success | abstract | — | — | 1 | 2026-06-20 |
| clean | success | clean | — | — | 1 | 2026-06-20 |
| chunk | success | chunk | — | — | 1 | 2026-06-20 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-20 |
| enrich | success | — | — | — | 2 | 2026-05-23 |
| promote | success | — | — | — | 2 | 2026-05-23 |
| summarize | skipped | llm | claude | — | 2 | 2026-05-30 |
| tag | success | vector_similarity | — | — | 14 | 2026-06-20 |
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- Empirical Findings: behavioral performance data