A taxiway is a path for aircraft at an airport connecting runways with aprons, hangars, terminals and other facilities. Taxiways are marked with yellow/white lines and alphanumeric signs to guide pilots and prevent runway incursions.
width=* – for the width of the taxiway (in meter), note this should specify the physical width of the taxiway on the ground, not the clearance.
clearance=* – for the clearance of the taxiway (in meter), note this should specify the maximum wing span an aircraft can have in the given taxiway segment.
surface=asphalt/concrete/grass/... – physical makeup of the surface of the taxiway.