438 

49 CFR Ch. I (10–1–23 Edition) 

§ 172.505 

freight containers, unit load devices, 
transport vehicles or rail cars which 
also contain Division 1.1 or 1.2 mate-
rials and which are placarded with EX-
PLOSIVES 1.1 or 1.2 placards, as re-
quired. 

(5) For transportation by transport 

vehicle or rail car only, an OXIDIZER 
placard is not required for Division 5.1 
materials on a transport vehicle, rail 
car or freight container which also con-
tains Division 1.5 explosives and is 
placarded with EXPLOSIVES 1.5 plac-
ards, as required. 

(6) The EXPLOSIVE 1.4 placard is not 

required for those Division 1.4 Compat-
ibility Group S (1.4S) materials that 
are not required to be labeled 1.4S. 

(7) For domestic transportation of 

oxygen, compressed or oxygen, refrig-
erated liquid, the OXYGEN placard in 
§ 172.530 of this subpart may be used in 
place of a NON-FLAMMABLE GAS 
placard. 

(8) For domestic transportation, a 

POISON INHALATION HAZARD 
placard is not required on a transport 
vehicle or freight container that is al-
ready placarded with the POISON GAS 
placard. 

(9) For Class 9, a CLASS 9 placard is 

not required for domestic transpor-
tation, including that portion of inter-
national transportation, defined in 
§ 171.8 of this subchapter, which occurs 
within the United States. However, a 
bulk packaging must be marked with 
the appropriate identification number 
on a CLASS 9 placard, an orange panel, 
or a white square-on-point display con-
figuration as required by subpart D of 
this part. 

(10) For Division 6.1, PG III mate-

rials, a POISON placard may be modi-
fied to display the text ‘‘PG III’’ below 
the mid line of the placard. 

(11) For domestic transportation, a 

POISON placard is not required on a 
transport vehicle or freight container 
required to display a POISON INHALA-
TION HAZARD or POISON GAS 
placard. 

(g) For shipments of Class 1 (explo-

sive materials) by aircraft or vessel, 
the applicable compatibility group let-
ter must be displayed on the placards, 
or labels when applicable, required by 
this section. When more than one com-
patibility group placard is required for 

Class 1 materials, only one placard is 
required to be displayed, as provided in 
paragraphs (g)(1) through (g)(4) of this 
section. For the purposes of paragraphs 
(g)(1) through (g)(4), there is a distinc-
tion between the phrases 

explosive arti-

cles 

and 

explosive substances. Explosive 

article 

means an article containing an 

explosive substance; examples include 
a detonator, flare, primer or fuse. 

Ex-

plosive substance 

means a substance 

contained in a packaging that is not 
contained in an article; examples in-
clude black powder and smokeless pow-
der. 

(1) Explosive articles of compat-

ibility groups C, D or E may be plac-
arded displaying compatibility group 
E. 

(2) Explosive articles of compat-

ibility groups C, D, or E, when trans-
ported with those in compatibility 
group N, may be placarded displaying 
compatibility group D. 

(3) Explosive substances of compat-

ibility groups C and D may be plac-
arded displaying compatibility group 
D. 

(4) Explosive articles of compat-

ibility groups C, D, E or G, except for 
fireworks, may be placarded displaying 
compatibility group E. 

[Amdt. 172–123, 55 FR 52600, Dec. 21, 1990] 

E

DITORIAL

N

OTE

: For F

EDERAL

R

EGISTER

ci-

tations affecting § 172.504, see the List of CFR 
Sections Affected, which appears in the 
Finding Aids section of the printed volume 
and at 

www.govinfo.gov. 

§ 172.505

Placarding for subsidiary 

hazards. 

(a) Each transport vehicle, freight 

container, portable tank, unit load de-
vice, or rail car that contains a poi-
sonous material subject to the ‘‘Poison 
Inhalation Hazard’’ shipping descrip-
tion of § 172.203(m) must be placarded 
with a POISON INHALATION HAZARD 
or POISON GAS placard, as appro-
priate, on each side and each end, in 
addition to any other placard required 
for that material in § 172.504. Duplica-
tion 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 

439 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 172.510 

contains 454 kg (1,001 pounds) or more 
gross weight of non-fissile, fissile-ex-
cepted, 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 de-
vice that contains a material which 
has a subsidiary hazard of being dan-
gerous when wet, as defined in § 173.124 
of this subchapter, shall be placarded 
with DANGEROUS WHEN WET plac-
ards, on each side and each end, in ad-
dition to the placards required by 
§ 172.504. 

(d) Hazardous materials that possess 

secondary hazards may exhibit sub-
sidiary 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, Dec. 21, 1990, as 
amended at 56 FR 66260, Dec. 20, 1991; 57 FR 
45460, Oct. 1, 1992; Amdt. 172–127, 59 FR 49133, 
Sept. 26, 1994; Amdt. 172–151, 62 FR 1231, Jan. 
8, 1997; 62 FR 39398, July 22, 1997; 65 FR 58626, 
Sept. 29, 2000; 72 FR 55692, Oct. 1, 2007; 79 FR 
40610, July 11, 2014; 82 FR 15874, Mar. 30, 2017] 

§ 172.506

Providing and affixing plac-

ards: Highway. 

(a) Each person offering a motor car-

rier a hazardous material for transpor-
tation by highway shall provide to the 
motor carrier the required placards for 
the material being offered prior to or 
at the same time the material is of-
fered for transportation, unless the 
carrier’s motor vehicle is already plac-
arded for the material as required by 
this subpart. 

(1) No motor carrier may transport a 

hazardous material in a motor vehicle, 
unless the placards required for the 
hazardous material are affixed thereto 
as required by this subpart. 

(2) [Reserved] 
(b) [Reserved] 

[Amdt. 172–29, 41 FR 15996, Apr. 15, 1976, as 
amended by Amdt. 172–29A, 41 FR 40679, Sept. 
20, 1976] 

§ 172.507

Special placarding provi-

sions: Highway. 

(a) Each motor vehicle used to trans-

port a package of highway route con-
trolled quantity Class 7 (radioactive) 
materials (see § 173.403 of this sub-

chapter) must have the required RA-
DIOACTIVE warning placard placed on 
a square background as described in 
§ 172.527. 

(b) A nurse tank, meeting the provi-

sions of § 173.315(m) of this subchapter, 
is not required to be placarded on an 
end containing valves, fittings, regu-
lators or gauges when those appur-
tenances prevent the markings and 
placard from being properly placed and 
visible. 

[Amdt. 172–103, 51 FR 5971, Feb. 18, 1986, as 
amended by Amdt. 172–143, 60 FR 50305, Sept. 
28, 1995] 

§ 172.508

Placarding and affixing plac-

ards: Rail. 

(a) Each person offering a hazardous 

material for transportation by rail 
shall affix to the rail car containing 
the material, the placards specified by 
this subpart. Placards displayed on 
motor vehicles, transport containers, 
or portable tanks may be used to sat-
isfy this requirement, if the placards 
otherwise conform to the provisions of 
this subpart. 

(b) No rail carrier may accept a rail 

car containing a hazardous material 
for transportation unless the placards 
for the hazardous material are affixed 
thereto as required by this subpart. 

[Amdt. 172–29, 41 FR 15996, Apr. 15, 1976, as 
amended by Amdt. 172–123, 55 FR 52601, Dec. 
21, 1990] 

§ 172.510

Special placarding provi-

sions: Rail. 

(a) 

White square background. 

The fol-

lowing must have the specified plac-
ards placed on a white square back-
ground, as described in § 172.527: 

(1) Division 1.1 and 1.2 (explosive) ma-

terials which require EXPLOSIVES 1.1 
or EXPLOSIVES 1.2 placards affixed to 
the rail car; 

(2) Materials classed in Division 2.3 

Hazard Zone A or 6.1 Packing Group I 
Hazard Zone A which require POISON 
GAS or POISON placards affixed to the 
rail car, including tank cars containing 
only a residue of the material; and 

(3) Class DOT 113 tank cars used to 

transport a Division 2.1 (flammable 
gas) material, including tank cars con-
taining only a residue of the material.