State-of-the-Art of Wrong-Way Driving on Freeways and Expressways

Friebele, John D.; Messer, Carroll J.; Dudek, Conrad L. · 1971 · ROSA P / Texas Transportation Institute. Texas A&M University

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Summary

This 1971 report by the Texas Transportation Institute reviews the state of knowledge regarding wrong-way driving on freeways and expressways. The study was motivated by the severe safety hazards associated with wrong-way maneuvers, which, while constituting a small fraction of total accidents, result in disproportionately high fatality rates. The primary objective was to evaluate the extent, causes, and preventive measures for wrong-way driving to inform the development of detection and communication systems capable of warning drivers of such maneuvers. The authors conducted a comprehensive literature review of studies conducted across the United States, with significant data drawn from California and Texas. The analysis examined roadway geometry, driver behavior, environmental factors, and existing preventive technologies. Specific attention was paid to interchange types, ramp configurations, sight distance, and the influence of alcohol impairment. The review also assessed the efficacy of various countermeasures, including signing, pavement markings, divergent roadways, and active warning devices. Key findings indicate that roadway geometry significantly influences wrong-way incident rates. Full cloverleaf interchanges exhibited the lowest entry rates, while partial interchanges had rates nearly twice as high. The most frequent wrong-way maneuver involved entering the freeway via an exit ramp. Two-way frontage roads were identified as unsatisfactory due to their tendency to mislead motorists. Alcohol impairment was a major factor, with drinking drivers involved in approximately 43% of wrong-way accidents in California and four-fifths of fatal wrong-way incidents where sobriety was known. Additionally, a majority of wrong-way maneuvers occurred during hours of darkness or reduced visibility. The report concludes that effective prevention requires a multi-faceted approach. Pavement markings, particularly raised retro-reflective markers, and "positive" signing techniques were found to be effective in warning drivers. Active detection and warning systems, such as those using inductive loops to trigger audio-visual alerts, demonstrated significant efficacy, reducing wrong-way entries by 54% in California tests and causing 89% of actuating drivers to correct their course. Conversely, spike barriers were deemed ineffective. The authors recommend further research into geometric features that influence wrong-way maneuvers, the feasibility of divergent ramp roadways to redirect or trap wrong-way vehicles, and the continued monitoring of detection technologies. Crucially, they emphasize that significant reductions in wrong-way fatalities require broader efforts to reduce drunk driving.

Key finding

Drivers entering via exit ramps at full cloverleaf interchanges had the lowest wrong-way entry rates, while drinking drivers were involved in approximately four-fifths of fatal wrong-way accidents where sobriety was known.

Methodology

review

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

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