# Conway Transportation Services — Hazardous Materials Safety Interpretation

**Citation:** 00-0360  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2001-01-26

00-0360 response to Conway Transportation Services concerning 172.313.

## Document text

<<<PAGE 1>>>

U.S. Department
of Transportation
400 Seventh Street, S.W.
Washington, D.C.
20590
peta Program
dministration
JAN 2 6 2001
Mr. Robert Petrancosta
Ref. No. 00-0360
Director
Conway Transportation Services
Safety and Environmental Compliance
110 Parkland Plaza
Ann Arbor, MI
48103
Dear Mr. Petrancosta:
This is in response to your December 22, 2000, letter regarding
the identification number marking requirements for poisonous by
inhalation (PIH) materials as specified in $ 172.313(c) of the
Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180)•
identification number to mark on a vehicle containing two
Specifically, you request guidance on determining which
different PIH materials in non-bulk packages in the same hazard
zone with identical gross weights.
Section 172.313 (c) (3) (i)
requires a transport vehicle or freight
container containing
different PIH materials in non-bulk packages
be marked with identification number of the material having the
greatest aggregate gross weight.
same hazard zone and gross weight, either identification number
marking may be used on the transport vehicle or freight
container.
I hope this satisfies your request.
Sincerely,
Transportation Regulations Specialists
Office of Hazardous Materials Standards
112.313
000360

<<<PAGE 2>>>

• BAH
8172. 313 ()GXi)
CTS COn-WAY TRANSPORTATION SERVICES
A CTIF COMANY
Marking
Director
ROBERT G. PENTRACOSTA
00-0360
Sately and Environmental Complance
December 22, 2000
Mr. Edward Mazzullo, Director
Research & Special Programs Administration
Offices of Hazardous Materials Safety
U.S. Department of Transportation
400 Seventh Street, SW
Washington, DC 20590-0001
MARKING REQUIREMENTS FOR PIH MATERIALS
REQUEST FOR WRITTEN INTERPRETATION
Dear Mr. Mazzullo:
As required under § 172.313(c)(3)(i), a transport vehicle containing different materials
poisonous by inhalation in the same hazard zone, shall be marked with the identification
number of the material having the greatest aggregate gross weight.
My question concerns a transport vehicle that contains two different materials poisonous
by inhalation in the same hazard zone that have identical gross weight.
Example: A transport vehicle is loaded at one facility with 1,000 kg (2,205 pounds)
Dichiorosilane, 2.3, UN 2189. Hazard Zone B, and, 1,000 kg (2.205 pounds) Acetone
identification number would be required to be displayed?
çyanohydrin, stabilized, 6.1, UN 1541, PG 1, Hazard Zone B. Which material
Thank you in advance for responding to this inquiry.
Sinceraly,
Rosser Peppercosto
Robert Petrancosta
cjg
(734) 768-0203 (734) 2115650 FAX wwk.con-way.com
110 PARKLAND PLAZA ANN ARBOR, MI 48103

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2000/000360.pdf>
- Source ID: `phmsa`
- SHA-256: `c0a759edb9a881df098cbaee3ecdfb8fc6276320b6b2f5dbb6af897d528e4aa1`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T12:35:48.499Z
- Document slug: `phmsa-interpretation-00-0360`

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