local vehicleList = this.vehicleList();
		local unitnumberList = AIList();
		for (local vehicle = vehicleList.Begin(); !VehicleList.IsEnd(); vehicle = vehicleList.Next()) {
			if (AIVehicle.IsValidVehicle(vehicle) && AIVehicle.GetVehicleType(vehicle) == AIVehicle.VT_ROAD) {
				local unitnumber = AIVehicle.GetUnitNumber(vehicle);
				if (!unitnumberList.HasItem(unitnumber) {
					unitnumberList.AddItem(unitnumber, vehicle);
				} else {
					local value = unitnumberList.GetValue(unitnumber);
					if (value != vehicle) {
						unitnumberList.SetValue(unitnumber, vehicle);
					}
				}
			}
		}