T236 Temporary Warning Barrier Arms not Working Road Signs, referred to as a W2-1.24 Sign in the TCD Rule, is a TW supplementary plate, are used to warn road users that the barrier arms are not operating. The T236 Barrier Arms not Working Traffic Sign is used underneath a T2 TW-2 Other Hazard 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).