Glossary of Truck Accidents Terms
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Hazmat: Hazardous materials, as classified
by the U.S. Environmental Protection Agency (EPA).
Transport of hazardous materials is strictly
regulated by the U.S. Department of Transportation.
Headache Rack: Heavy protective barrier
mounted behind the tractor's cab. Designed to
prevent "headaches" caused by load shifting forward
from the trailer and crushing the cab.
HCFC: Hydrochlorofluorocarbon.
Horsepower (hp): Measure of power (the amount
of work that can be done over a given amount of
time). One horsepower is defined as 33,000
foot-pounds of work in one minute. Example: Lifting
33,000 pounds one foot in one minute, or lifting
3300 pounds ten feet in one minute.
Horsepower, Gross Laboratory: Tested
horsepower of a "bare" engine without fan, water
pump, alternator, exhaust system or any other
accessories.
Horsepower, SAE Net: Horsepower capability of
an engine with full accessories and exhaust system.
Test procedures per standards of Society of
Automotive Engineers (SAE).
Hours-Of-Service: U.S. Department of
Transportation safety regulations which govern the
hours of service of commercial vehicle drivers
engaged in interstate trucking operations.
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