Traveler Information Requirements During Nonrecurring Events

Balk, Stacy A.; Arnold, Michelle · 2019 · ROSA P / United States. Federal Highway Administration. Office of Safety Research and Development

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Summary

This report investigates the specific traveler information messages most likely to influence driver behavior during nonrecurring events, such as traffic incidents, road work, or adverse weather. While Advanced Traveler Information Systems (ATIS) provide abundant data, simply broadcasting information does not guarantee behavioral change. The study aims to identify which message components effectively promote desired actions, such as route changes or speed adjustments, to improve safety and mobility. The research was motivated by the need to understand how drivers interpret different message structures and how these interpretations translate into actual driving decisions. The study employed three distinct experiments. Experiment 1 focused on pretrip information needs, examining how event type and trip importance influenced intended behavior compared to delivery mode. Experiments 2 and 3 evaluated mid-trip information via Variable Message Signs (VMS). Experiment 2 assessed the effect of specific VMS message components—such as location, action requests, and signal words—on reported driving behavior through surveys and likelihood ratings. Experiment 3 utilized a driving simulator to measure actual behavioral responses, including lane changes and driving speeds, when participants encountered simulated nonrecurring events with varying VMS messages. Key findings indicate that event type and trip importance had a greater effect on intended pretrip behavior than the mode of information delivery. For mid-trip VMS messages, information was most likely to influence behavior if it included a specific action request. Participants preferred messages that made declarative statements about the actual state of the road over those providing speculative information. In the driving simulator, drivers who received traveler information prior to encountering a simulated event reported significantly lower stress levels than those who received no information. Furthermore, the study found that drivers with moderate knowledge of a road network were most willing to change routes in response to traveler information, whereas those with low or high knowledge were less likely to divert. The significance of this research lies in its practical recommendations for traffic management center operators and transportation agencies. The report concludes that effective messaging during nonrecurring events should include clear, declarative statements about road conditions and specific suggested actions. By tailoring messages to include these components, agencies can better influence traveler behavior, reduce driver stress, and mitigate the impacts of unexpected roadway disruptions. The findings underscore that while access to information is critical, the specific content and structure of the message are paramount for inducing the behavioral changes necessary to maintain traffic flow and safety.

Key finding

Variable message sign messages that included a specific action request were most likely to influence driver behavior, and drivers provided with pre-event information reported less stress than those without information.

Methodology

mixed_methods

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

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• external distraction