| 摘要 |
PROBLEM TO BE SOLVED: To provide a road surface condition detecting device capable of exactly detecting road surface conditions such as slipperiness of the road in running at a constant speed. SOLUTION: When a determining circuit 16, as a determining means of the road surface condition, detects a water film based on a detection signal from a water film sensor 12, as a wafer film detecting means for detecting a water film between the tire and the road surface, and from a wheel speed sensor 14 for detecting the wheel speed, it is determined that the road surface is more slippery when roughness of the road surface is less and the vehicle speed is greater, an alarm device 18 provided on the outside of the device provides an alarm, and a vehicle control device 20 slows down the vehicle automatically. |
