Independent Evaluation of the Driver Acceptance of the Cooperative Intersection Collision Avoidance System for Violations (CICAS-V) Pilot Test

Stearns, Mary (Mary D.); Garay-Vega, Lisandra · 2011 · ROSA P / United States. Department of Transportation. National Highway Traffic Safety Administration

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Summary

This report presents an independent evaluation of driver acceptance for the Cooperative Intersection Collision Avoidance System for Violations (CICAS-V), conducted by the Volpe National Transportation Systems Center. The study was motivated by the need to assess the readiness and maturity of this Intelligent Transportation System technology prior to a large-scale field operational test. CICAS-V is designed to warn drivers when they are predicted to violate a stop sign or traffic signal, thereby preventing intersection crashes. The system utilizes roadside equipment to transmit signal timing and geometry data to vehicle onboard equipment, which triggers warnings via auditory (speech), visual (dash display), and haptic (brake pulse) modalities. The evaluation analyzed data from 79 naive drivers who participated in a 2008 pilot test conducted by the Virginia Tech Transportation Institute. Participants drove CICAS-V-equipped vehicles along a prescribed two-hour route in Virginia, navigating ten stop-controlled and three signal-controlled intersections. To ensure sufficient data on alert perception, 18 drivers also completed a test-track study where a distraction task was induced to trigger alerts during signal changes. Post-drive questionnaires were administered to assess satisfaction, perceived safety, usability, and endorsement. The study distinguished between drivers who received alerts during public road driving ("pseudo-naturalistic") and those who only received alerts during the controlled test-track scenario. The findings indicate that overall driver acceptance was neutral to slightly satisfied. Only 46% of participants received at least one violation alert, with the majority of valid alerts occurring at stop signs using an earlier algorithm version. Drivers who experienced alerts rated the speech and brake pulse modalities as easy to detect and effective, whereas the visual "intersection ahead" display was viewed as less conspicuous and somewhat distracting. Alert timing was generally perceived as appropriate, though some subjects felt it was slightly late. A significant discrepancy existed between subjective and objective violations: 65% of drivers believed they had nearly violated an intersection, compared to the 46% who actually triggered an alert. Crucially, endorsement of the system depended heavily on experience; drivers who received alerts were willing to purchase the system, while those who did not receive alerts definitively rejected it. The study concludes that drivers require direct experience with the system to form fair assessments of its utility. The results highlight the importance of alert modality design, particularly the need for more conspicuous visual warnings, and suggest that the low frequency of actual intersection violations may limit driver engagement. These findings provide critical insights for refining CICAS-V interfaces and strategies for future field operational tests, emphasizing that perceived safety and satisfaction are contingent on the driver’s exposure to the warning system.

Key finding

Drivers were neutral to slightly satisfied with the CICAS-V system and rated the speech and brake pulse alerts as effective, while the visual display was perceived as less conspicuous.

Methodology

mixed_methods

Sample size: 79

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).

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.

• auditory warnings
• vru facing ehmi
• rail grade crossings
• ehmi external hmi
• in vehicle coaching

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).

• Applied Guidance: countermeasure evaluation
• Empirical Findings: self report data
• Methodological Resource: validation psychometrics