Abstract: A parking station supervisory system particularly contemplated to avoid a traffic congestion when a vehicle is leaving is disclosed. It has a vehicle entry detector provided at an entrance, an automatic ticket issuance device installed close to the entrance, a parking fee adjusting device installed at an adequate place where drivers or users often drop in, and a vehicle departure control device installed at an exit of the parking station. When a parking ticket is inserted, the parking fee adjusting device reads the entry time recorded on the ticket and calculates the parking fee. Upon payment of the parking fee, the ticket is returned to a driver with an allowable departure time recorded on it. When a vehicle is going to leave, the driver is only required to insert the ticket into the vehicle departure control device. As long as it is within the allowable departure time, an exit gate bar is immediately opened for allowing the vehicle to leave.