T234 Temporary Warning Hidden Queue Road Signs, referred to as a W2-1.23 Sign in the TCD Rule, is a TW supplementary plate, are used to warn road users that there is likely to be a queue ahead or queues ahead which may be obscured. The T234 Hidden Queue 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).