US Patent 10101168 Route calculation device for vehicle

A route calculation device determines a candidate point for a branch off a first avoidance route to a second avoidance route at a time of calculating the second avoidance route. The candidate point is determined based on a traveling direction and speed of a vehicle at each point on the first avoidance route, a tangential direction of a boundary line of a second avoidance area at a predicted entry point into the second avoidance area, and a certain yaw rate not more than a maximum yaw rate of the vehicle.