In order to improve road safety automobile manufacturers are now developing Forward Collision Warning Systems (FCWS). However, there has been insufficient consideration of how drivers may respond to FCWS. This driving simulator study focused on alarm timing and its impact on driver response to alarm. The experimental investigation considered driver perception of alarm timings and its influence on trust at three driving speeds (40, 60, and 70 mile/h), and two time-headways (1.7 and 2.2s). The results showed that alarm effectiveness varied in response to driving conditions. Alarm promptness had a greater influence on trust ratings than improvements in braking performance enabled by the alarm system. Furthermore, alarms that were presented after braking actions had been initiated were viewed as late alarms. It is concluded that drivers typically expect alarms to be presented before they initiate braking actions, and when this does not happen driver trust in the system is substantially decreased.
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