The relation between vehicle′s wiggly behavior and reaction time of the driver of the vehicle was analyzed for general drivers when they ran local streets like usually in the state of usual awakening level. Gas-pedal reaction time of a driver to brake lamp lighting of a leading vehicle was used as the reaction time. As a result, the wiggly behavior while a vehicle runs along a straight lane was statistically related to the reaction time of the driver of the vehicle. And, statistical relation between the mean log power in the frequency band of 0.2-0.8 Hz of each of lateral displacement, deviation of lateral displacement, and steering angle of a vehicle and the distribution of the reaction time was revealed.