Section 172.505 - Placarding for subsidiary hazards(a) Each transport vehicle, freight container, portable tank, unit load device, or rail car that contains a poisonous material subject to the "Poison Inhalation Hazard" shipping description of §172.203(m) must be placarded with a POISON INHALATION HAZARD or POISON GAS placard, as appropriate, on each side and each end, in addition to any other placard required for that material in §172.504. Duplication of the POISON INHALATION HAZARD or POISON GAS placard is not required.(b) In addition to the RADIOACTIVE placard which may be required by §172.504(e), each transport vehicle, portable tank or freight container that contains 454 kg (1,001 pounds) or more gross weight of non-fissile, fissile-excepted, or fissile uranium hexafluoride must be placarded with a CORROSIVE placard and a POISON placard on each side and each end.(c) Each transport vehicle, portable tank, freight container or unit load device that contains a material which has a subsidiary hazard of being dangerous when wet, as defined in §173.124 of this subchapter, shall be placarded with DANGEROUS WHEN WET placards, on each side and each end, in addition to the placards required by §172.504.(d) Hazardous materials that possess secondary hazards may exhibit subsidiary placards that correspond to the placards described in this part, even when not required by this part (see also §172.519(b) (4) of this subpart).Amdt. 172-123, 55 FR 52601, 12/21/1990, as amended at 56 FR 66260, 12/20/1991; 57 FR 45460, 10/1/1992; Amdt. 172-127, 59 FR 49133, 9/26/1994; Amdt. 172-151, 62 FR 1231, 1/8/1997; 62 FR 39398, 7/22/1997; 65 FR 58626, 9/29/2000; 72 FR 55692, 10/1/2007; 79 FR 40610, 7/11/2014; 82 FR 15874, 3/30/2017