Abstract
We investigated the drivers' behavior in terms of avoiding collision or lane deviation, when equipped with multiple driving assistance system like Adaptive Cruise Control system (ACC) and Lane Keeping Assistance system (LKA). When we compare the driving behavior of using ACC and LKA with the driving of using single ACC, even though we observed the driver tends to carry out the secondary task like the operation of navigation system when following to a preceding vehicle, the possibility of rear-end collision was not increased. The driver also distributed attention to avoid collisions properly. Regarding the frequency of lane deviation, if we compare the driving behavior of using ACC and LKA with the driving of using single LKA, the frequency of lane deviation was even decreased. Many drivers reported that it was easy to concentrate on steering operation in using combined system. The driver seemed to be distributing his/her attention to several tasks adequately when equipped with ACC and LKA.
