  Foreign substances on the road surface, such as rainwater or black ice,
reduce the friction between the tire and the surface. The above situation will
reduce the braking performance and make difficult to control the vehicle body
posture. In that case, there is a possibility of property damage at least. In
the worst case, personal damage will be occured. To avoid this problem, a road
anomaly detection model is proposed based on vehicle driving noise. However,
the prior proposal does not consider the extra noise, mixed with driving noise,
and skipping calculations for moments without vehicle driving. In this paper,
we propose a simple driving event extraction method and noise reduction method
for improving computational efficiency and anomaly detection performance.
