ANOMALOUS TRAVEL LOCATION DETECTION DEVICE AND ANOMALOUS TRAVEL LOCATION DETECTION METHOD

An anomalous travel location detection device detects anomalous travel locations. An anomalous travel location is a location where anomalous travel in the width direction of the road occurs. A history information obtainer obtains, from a vehicle, travel history information that includes a turning value. The turning value indicates a physical amount related to the position of the vehicle and the turning of the vehicle. A turning value corrector corrects the turning values contained in multiple pieces of the travel history information. The turning values are corrected to turning values associated with each instance of a preset calculation points. A reference turning value calculator uses multiple turning values that have been associated with the same calculation point to calculate a reference turning value. The reference turning value is an average turning value. An anomalous travel location detector calculates the divergence from the reference turning value for each piece of travel history information subjected to detection of an anomalous travel location. Locations for which the deviation from the reference turning value is large are detected as anomalous travel locations.