T138 or TW01.6 Temporary Warning Shoulder Closed Road Signs, referred to as a W1-1.7 Sign in the TCD Rule, is a supplementary plate, used to indicate that the shoulder is closed off by road works on a trafficable road. The TW-1.6 Shoulder Closed Traffic Sign is used underneath a T1 TW-1 Road Works Sign and available for Level One or Level 2/3 New Zealand Roads for Temporary Traffic Management (TTM) and is in the Waka Kotahi Code of Practice (CoPTTM).