Visual in-car warnings: How fast do drivers respond?

van der Heiden, Remo M.A.; Janssen, Christian P.; Donker, Stella F.; Merkx, Chantal L. · 2018 · OpenAlex-citations

DOI: 10.1016/j.trf.2018.02.024

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Summary

This study investigates the reaction times of drivers responding to visual in-car warnings regarding upcoming lane closures, a scenario motivated by the deployment of roadside beacons that transmit wireless alerts to vehicles. The primary research question addresses whether the typical beacon range of 500 meters, reduced to 350 meters by the presence of tactile rumble strips, provides sufficient distance for drivers to execute a safe lane change. The authors specifically examine how cognitive distraction impacts this performance, given that drivers frequently engage in secondary tasks. The researchers conducted a driving simulator experiment with 24 participants using a 2 (driving speed: 80 km/h vs. 130 km/h) by 3 (audio task: none, repeat, generate) within-subjects design. Participants performed lane changes in response to visual warnings on a simulated navigation display while simultaneously engaging in an audio task designed to induce varying levels of central cognitive interference. The "generate" condition, requiring participants to produce a word starting with the last letter of a heard word, served as the high-distraction condition, while "repeat" and "no audio" served as lower-distraction controls. Metrics included initial reaction time, lane change distance, audio task reaction time, and subjective mental workload. Additionally, the authors employed a Monte Carlo simulation model, integrating their empirical data with historical eye-gaze data from Robinson et al. (1972), to predict lane change distributions in real-world traffic conditions where mirror checks and shoulder glances are required. Results indicated that cognitive distraction significantly delayed initial reaction times; the generate condition resulted in a mean reaction time of 1.52 seconds, significantly slower than the repeat (1.25 s) and no-audio (1.24 s) conditions. While average lane change distances remained within the 350-meter limit in the simulator, individual variability revealed that some drivers failed to react in time. The simulation model, which accounted for additional real-world steps like visual checks, projected that approximately 50% of drivers traveling at 130 km/h would fail to complete a lane change before reaching the rumble strips (350 m) if warned at the beacon's limit. Furthermore, the model suggested that to ensure safety for all drivers, warnings would need to be received at least 770 meters before the roadwork site, far exceeding current beacon capabilities. The study concludes that visual in-car warnings triggered by current beacon technology are likely insufficient for ensuring timely lane changes, particularly at higher speeds and under cognitive distraction. The findings imply that relying solely on these signals poses a serious safety hazard, as a significant portion of drivers may not react in time. The authors suggest that these results should inform the design of safer road infrastructure and in-car interfaces, potentially requiring earlier warning distances or complementary warning systems to mitigate the risks associated with roadwork zones.

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Topics

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• visual
• auditory
• auditory warnings
• temporal
• external distraction
• hazard perception

Information type

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• Applied Guidance: design guidelines
• Empirical Findings: behavioral performance data
• Methodological Resource: measurement protocol