On the premise of closed control, when an oncoming traffic lane is used to overtake a vehicle, the load with respect to wireless communication is reduced, and the impact on the travel time interval between vehicles in the oncoming traffic lane is reduced further. A first travel permitted sector 108 in which only a subject vehicle 20-1 is permitted to travel, and a second travel permitted sector 81-2 in which travel is permitted only by another vehicle 20-2 which has stopped in a position in front of the subject vehicle 20-1 and in the lane on which the subject vehicle 20-1 is traveling, are defined. An overtaking route for the subject vehicle 20-1 to overtake the other vehicle 20-2 is created, comprising: a first transition sector 105 for the subject vehicle to change lanes from the lane in which said subject vehicle is traveling, to the oncoming traffic lane; an overtaking sector 100 which is continuous with a node at a front end portion of the first transition route 105 and which is formed by means of a link defined in the oncoming traffic lane; and a second transition sector 106, continuous with a node at a front end portion of the overtaking sector 100, for returning from the overtaking sector 100 to the traveling lane. In this case, the sector length of the pre-defined second travel permitted sector 81-2 is reduced.