1102 Designing method of the warning timing for driving support systems based on driver's behavior : Optimization of the warning timing for Lane Departure Warning System and Forward Vehicle Collision Warning System

We proposed the designing methodology to optimize the warning timing of Lane Departure Warning System and Forward Vehicle Collision Warning System. This warning timing can keep the time margin to avoid the lane departure or collision, and also minimize the fiequency of warning outputs. As regards the time margin, we observed that 90%ile of maximum lateral deviation is less than 0.3m when the warning timing was set at Time to Lane Departure = 1.0s, and also clarified that all of the driver can avoid the collision to the preceding vehicle when the warning timing was set at Assumed Delay Time = 1.0s in the Stopping Distance Algorithm. As regards the warning frequency, we observed that the frequency of lane departure warning is less than 0.5% when the warning timing was set at Time to Lane Departure =1.0s, and the frequency of forward vehicle collision warning is less than 0.5% when the warning timing was set at Assumed Delay Time = 1.0s. It can be concluded that Time to Lane Departure =1.0s and Assumed Delay Time = 1.0s are one of the appropriate timing for lane departure warning and forward vehicle collision warning in view of keeping the time margin and also minimizing the frequency of warning outputs.