# Department of the Army — Hazardous Materials Safety Interpretation

**Citation:** 01-0294  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2001-12-27

01-0294 response to Department of the Army concerning 177.848.

## Document text

<<<PAGE 1>>>

•
of Transportation
U.S. Department
Washington, D.C. 20590
400 Seventh St., S.W.
research and
Armint railons
DEC 27 2001
Mr. William R. Frerichs
Department of the Army
Ref. No. 01-0294
US Army Defense Ammunition Center
1 C Tree Road
McAlester, OK 74501-9053
Dear Mr. Frerichs:
This responds to your November 19, 2001 letter requesting additional clarification of our response
letter Ref. No. 01-0280 regarding segregation requirements under the Hazardous Materials Regulations
(HMR; 49 CFR Parts 171-180). Specifically, you ask whether a dromedary unit that is attached to a
Heavy Expanded Mobility Tactical Truck with a Load Handling System (HEMTT-LHS), equipped
with a flatrack with cargo, is considered to be a separate transport vehicle from the dromedary box.
You intend to transport incompatible explosives separated in this manner.
It is the opinion of this Office that a dromedary box loaded with explosives attached to a HEMTT-LHS
that also has a flatrack loaded with explosives is considered to be one transport vehicle, and, is not
acceptable for hazardous materials, including incompatible explosives, that may not be transported on
the same transport vehicle under § 177.848. However, if the flatrack loaded with explosives is loaded
onto a separate trailer attached to the back of the HEMTT-LHS, the combination motor vehicle is
considered to be two separate transport vehicles, and is acceptable for hazardous materials that require
segregation of incompatible explosives on the same transport vehicle.
I hope this additional clarification on transporting incompatible explosives is helpful.
Sincerely,
Delmer F. Billings
Chief, Standards Development
Office of Hazardous Materials Standards
177,848
010294
-

<<<PAGE 2>>>

Boothe
DEPARTMENT OF THE ARMY
5197.848
DEFENSE AMMUNITION CENTER
MrAlester, Oklshoma 74501-9053
segrigatione
REPLY TO
01 - 0294
ATTENTION OF:
SOSAC-DE
November 19, 2001
Chief, Standards Development
Mr. Delmer F. Billings
Office of Hazardous Materials Standards
400 7* Street SW
Washington, DC 20590
SUBJECT: Request for Clarification of Response Letter
1. This is a request for a clarification to your response letter dated Oct 30, 2001
(Ref. No:01-0280).
2. The DROM box with the incompatible explosive items is attached directly to
(HEMTT-LHS). The HEMTT-LHS vehicle transports the primary cargo on the
the Heavy Expanded Mobility Tactical Truck with the Load Handling System
demountable flatrack. Once the HEMTT-LHS arrives at destination, the flatrack
with cargo is offloaded to the ground and the HEMTT-LHS with the DROM box
and incompatible items drives away.
3. This office believes that the HEMTT-LHS with the DROM box is considered a
separate transportation vehicle from the demountable flatrack with cargo.
4. Are we correct in our interpretation that the HEMTT-LHS with the DROM box
and incompatible items is a separate transportation vehicle from the
demountable flatrack with cargo? Also, does the HEMTT-LHS equipped with the
DROM box with incompatible items comply with the 49 CFR, section 177.848,
Segregation of Hazardous Materials?
5. Enclosed are your response letter, our original request letter, and the
background information on dromedary box and the HEMTT-LHS vehicle.
6. Point of contact is Mr. Michael Bartosiak, SMAAC-DET, commercial telephone
number (918) 420-8083.
•for the Director:
wellion R. French
Encl
William R. Freichs
Associate Director for Engineering

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2001/010294.pdf>
- Source ID: `phmsa`
- SHA-256: `29ae969c4e2bbbc8b1018484b1029ae9a82403aa48c485547f16d240bde30193`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T09:55:38.918Z
- Document slug: `phmsa-interpretation-01-0294`

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