Alarm timing, trust and driver expectation for forward collision warning systems.

Area of Science:

• Human Factors
• Automotive Engineering
• Road Safety

Background:

• Automobile manufacturers are developing Forward Collision Warning Systems (FCWS) to enhance road safety.
• Driver response and trust in FCWS are critical but under-researched aspects.
• Understanding alarm timing is essential for effective FCWS design.

Purpose of the Study:

• To investigate the impact of alarm timing on driver responses to Forward Collision Warning Systems (FCWS).
• To evaluate driver perception of alarm timings and its influence on trust under various driving conditions.
• To determine optimal alarm presentation relative to driver braking actions.

Main Methods:

• A driving simulator study was conducted to assess driver responses to FCWS alarms.
• Experiments involved varying driving speeds (40, 60, 70 mph) and time headways (1.7, 2.2 s).
• Driver perception of alarm timing and trust ratings were collected and analyzed.

Main Results:

• Alarm effectiveness was found to vary significantly with different driving conditions.
• The promptness of FCWS alarms had a greater impact on driver trust than braking performance improvements.
• Alarms presented after the initiation of braking were perceived as 'late' by drivers.

Conclusions:

• Drivers expect FCWS alarms to be presented before they initiate braking actions.
• Delayed alarms substantially decrease driver trust in Forward Collision Warning Systems.
• Optimizing alarm timing is critical for building and maintaining driver trust in safety systems.