Road situation grasping system and road condition grasping device

摘要

This system for gauging road conditions is a system provided with a vehicle on-board device, and an information processing device for processing information transmitted by the vehicle on-board device. The vehicle on-board device is provided with: a location detection unit for detecting the location of a vehicle; an image capture unit for capturing images of the vehicle surroundings; a inter-vehicle distance calculation unit for calculating inter-vehicle distances relative to other vehicles, on the basis of images captured by the image capture unit; a vehicle density calculation unit for calculating the density of vehicles traveling at the detected location of the vehicle, on the basis of the calculated inter-vehicle distances and the location in question; and a transmission unit for transmitting to the information processing device road information that includes the detected location of the vehicle and the calculated vehicle density. The information processing device is provided with a road condition calculation unit which, on the basis of the transmitted road information, performs aggregate calculations of road information on the route traveled by the vehicle, and calculates road conditions indicating the state of congestion on the route.