xNNN,Detailed Type 1
900,Kerbs
920,Plain kerbs
921,Plain kerbs with bevelled and/or moulded internal faces
940,Kerbs with posts at the corners
941,Kerbs with posts at the corners and bevelled and/or moulded internal faces
960,Kerbs with three posts at each side
961,Kerbs with three posts at each side and bevelled and/or moulded internal faces
970,Kerbs with high railings
978,Railings only (no kerbs visible)
980,Kerbs with chains