boolean function ( ) { return dual != null ; }
whether or not this road has a dual . concode_field_sep Road dual concode_elem_sep String name concode_elem_sep List<Lane> lanes concode_elem_sep BasicMap map concode_field_sep void addTheRightMostLane concode_elem_sep String getName concode_elem_sep void setDual concode_elem_sep String toString concode_elem_sep List<Lane> getLanes concode_elem_sep Road getDual concode_elem_sep double getMaximumConnectedSpeedLimit concode_elem_sep Lane getIndexLane