There are many limits such as shadowing occlusion and no
lights in the video image detector systems. In order to make
accurate detector system, we need to get rid of these
problems specially accident detection system by using
vehicle trace. In this paper, we introduce a method to
overcome shadow and nighttime has been introduced as
well as the accurate accident detection system. We find the
flow of vehicle trace is such as level spacing distribution as
Wigner distribution. It is in the level statistics when the
vehicle trace is avoidable. From this distribution we can
derive a probability induced by different of position for each
lane. Using this equation we can find abrupt state of vehicle
flow comparing with normal flow. We shall show statistical
results from some experiments for this system evaluation.