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O

OAL

Overall length of a vehicle. See Also Chassis Dimensions  

Odometer A mileage counter that registers total miles traveled. Located on the dial section of most speedometers.  

Occupational Safety and Health Administration (OSHA)

The federal agency that promulgates and ensures compliance of regulations dealing with on-the-job safety and health. Some motor vehicle regulations are included that apply to vehicles used in off-highway job sites. Compliance is the responsibility of the vehicle owner.

Odometer

A mileage counter that registers total miles traveled. Located on the dial section of most speedometers.

Off-Road

Slow speed operations over uneven surfaces such as lumbering operations, oil field work, geological surveying, operations at mining sites, road construction and other major construction sites.  

OMCS

Abbreviation for Office of Motor Carrier Safety, an office of the Federal Highway Administration within the Department of Transportation. Responsible for developing and implementing national motor carrier standards and intermodal hazardous materials regulations and issuing interpretations and reviewing state laws and regulations.

On/Off-Road

Operations mostly on hard surfaced or graded roads with some work over unprepared surfaces. In this category are most highway units not operated over regular routes such as farm trucks, dump trucks, concrete mixers, lumber delivery, trucks, etc.

Open Top

A body without a permanent top assembly.  

OSHA Abbreviation for Occupational Safety and Health Administration, the Federal agency which promulgates and ensures compliance of regulations dealing with on the job safety and health. Some motor vehicle regulations are included that apply to vehicles used in off 
Outriggers

Folding or sliding leg devices attached to trucks to give additional support down to the ground for maximum stability.  

Overall Vehicle Height

Distance from the ground to the highest point on the vehicle.  

Overall Vehicle Width

Refers to the nominal design dimension of the widest part of the vehicle, exclusive of signal lamps, outside rearview mirrors, flexible fender extensions and mud flaps, determined with doors and windows closed and the wheels in the straight-ahead position.

Overhang

(a) The horizontal distance from the center line of the hinge to the rear of the body on a tilting body (b) The distance from the center of the rear axle(s) to the rearmost surface of the truck body. Usually applies to nontilting bodies.