Stop, Yield, and No Control at Intersections
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Summary
This 1981 study, conducted by the Texas Transportation Institute for the Federal Highway Administration, addresses the lack of specific warrants for installing STOP, YIELD, or no control signs at low-volume intersections. While the Manual on Uniform Traffic Control Devices (MUTCD) provides general guidelines, it lacks definitive criteria for intersections with volumes below 500 vehicles per day (vpd). The research aimed to determine the operating characteristics and relative hazards of these control types to establish objective criteria for their application, balancing safety, fuel consumption, and road user costs. The researchers conducted field observations and measurements at 140 low-volume intersections across three regions: Texas (60 sites), Florida (40 sites), and New York (40 sites). The study examined intersections with major roadway volumes up to 10,000 vpd, varying geometries (3-leg and 4-leg), and locations (urban and rural). Data collected included driver behavior (forced stops, voluntary stops, entry speeds), accident history over three years, travel times, and physical characteristics such as sight distance. Statistical analyses, including ANOVA and chi-squared tests, were used to evaluate the effects of control type, volume, geometry, and sight distance on safety and operations. Key findings indicated that region, location, and intersection geometry had negligible effects on safety and operations. Crucially, increasingly restrictive control (STOP signs) did not reduce accident experience compared to YIELD or no control. In fact, STOP control resulted in the highest travel times and total road user costs, while YIELD control yielded the lowest costs. Driver compliance was low across all types, with less than 20% of drivers voluntarily stopping regardless of the sign present. Major roadway volume was the most significant factor; accident rates increased significantly at volumes above 2,000 vpd, and travel times rose by approximately two seconds at these higher volumes. Sight distance had no discernible effect on safety or operations. Based on these results, the study proposed specific criteria for sign installation. STOP signs are recommended only where sight distance permits a safe approach speed of less than 10 mph or where there is a history of two or more accidents in three years (or three if minor volume exceeds 300 vpd). YIELD signs are suggested for intersections with adequate sight distance and fewer accidents, particularly when minor roadway volumes exceed 300 vpd. No control is appropriate where sight distance is adequate and accident history is minimal. The study concludes that YIELD control is generally more cost-effective than STOP control for low-volume intersections, challenging the conventional wisdom that stricter controls inherently improve safety.
Key finding
Yield control resulted in the lowest travel times and road user costs among the three control types, while increasingly restrictive control did not produce lower accident experience.
Methodology
field_study
Sample size: 140
Provenance
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| 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: crash risk outcomes