What does I*DRR stand for?
Integration of Driver Response Research. Q: Does I*DRR account for driver vision A: No, I*DRR has been specifically designed to attempt to report response times for all drivers regardless of individual differences. Q: Is the “Absolute threshold” reported in the vehicle following section the point that the driver should be able to first see the vehicle ahead? If so, it does not seem correct, because I could see the lead vehicle from over 1/2 mile away. A: The absolute threshold is not the “seeing” distance, it is the threshold at which 50% of drivers will be able to detect the relative velocity between their vehicle and the lead vehicle. Up until that point, they may “see” the lead vehicle, and they may be able to detect that they are “closing upon” the lead vehicle, but they will not likely be able to understand that they are closing upon the lead vehicle at a dangerous rate until they reach that threshold. Also, the absolute threshold is WHERE DRIVERS “MAY” DETECT, NOT NECESSARILY WHE
