Drives choice of time-to-collision thresholds for a collision warning system

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


Collision warning systems (CWS) lower the risk of rear-end collisions by alerting drivers of imminent impacts (e.g., by sound). However, if warnings are perceived to be too far ahead of possible collisions, drivers may view them as annoying and gradually respond to them more slowly or even ignore them altogether. A possible solution is to let drivers set time-to-collision (TTC) thresholds themselves. This solution, however, to the best of our knowledge, has never been studied. Twenty six drivers used a smartphone-based CWS with an adjustable threshold on their daily trips. They were informed that they were allowed to change the warning threshold if they wished to do so. Their time-stamped acceleration and warnings were recorded. We aimed to test whether drivers who set the threshold comply more with warnings afterwards. We found that only three drivers changed the threshold and that the majority of drivers reported that they were content with the default threshold. In future studies we will examine whether the default TTC was indeed acceptable to most drivers or maybe it is the "power of default" that makes drivers refrain from customizing their CWS.

Original languageEnglish
Title of host publicationEuropean Conference on Cognitive Ergonomics
Subtitle of host publicationSimulation, Visualisation and Digital Technologies, ECCE 2016
ISBN (Electronic)9781450342445
StatePublished - 5 Sep 2016
Event34th European Conference on Cognitive Ergonomics, ECCE 2016 - Nottingham, United Kingdom
Duration: 6 Sep 20168 Sep 2016

Publication series

NameACM International Conference Proceeding Series


Conference34th European Conference on Cognitive Ergonomics, ECCE 2016
Country/TerritoryUnited Kingdom


  • Collision warning systems
  • Rear-end collisions
  • TTC
  • Warning threshold


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