setLength(string, double) -> None

        Sets the length in m for the given vehicle.

def setLength(self, vehID, length):
        """setLength(string, double) -> None

        Sets the length in m for the given vehicle.
        """
        self._connection._sendDoubleCmd(
            tc.CMD_SET_VEHICLE_VARIABLE, tc.VAR_LENGTH, vehID, length)