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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: SAE Int J Transp Saf. 2016 Apr;4(1):107–112. doi: 10.4271/2016-01-1439

Figure 1.

Figure 1

Illustration of the FCW visuals. As the participant nears a vehicle ahead (depicted left to right), the size of the ‘red’ visual rectangle increases as a function of the increase in time-to-collision (TTC) value. When TTC <= 2.0 seconds, the visual is at its largest and is accompanied by a beeping tone to alert the driver to imminent danger. FCW system was only active at speeds above 5 mph to avoid over-alerting when approaching other vehicles at an intersection or in low speed traffic.