T142 or TW01B.1.1 Temporary Warning Alternative Road Workers Ahead Road Signs, referred to as a W1-2B Sign in the TCD Rule, is a supplementary plate, used to give advance warning of major long-term work sites. The distance shown is normally 1 km i.e. the distance from the cone taper to the sign. The TW-1B.1.1 Road Workers Ahead Traffic Sign is used underneath a T1 TW-1 Road Works Sign and used on Level 2/3 New Zealand Roads for Temporary Traffic Management (TTM) and is in the Waka Kotahi Code of Practice (CoPTTM). KM Distance variations as 1 km 2 km.