RG09 No Entry Signs Level 2/3 (HKL) Signs, also known as a RD2, RG-9 or a R3-4 sign, are used in temporary traffic management (TTM) where there is a partial road closure and approaching vehicles are not permitted to enter a road section eg one direction closed and the carriageway is temporarily made into a one-way road. RD2 No Entry Signs must be augmented with T1A/B road works signs and TD-type detour direction indicator signs used to indicate the shortest alternative route with an adequate width and no height restrictions. This sign can only be used after formal authorisation by the controlling authority.