Highway Traffic and Road Safety

 

Transportation Terms - D

 

 

 

 

 

Dedicated Run A run that typically always goes to the same place, on nearly the same schedule. Many drivers would love to get a dedicated run. As a result, you usually have to wait awhile before it's offered/available to you.

 

Dead-Heading Operating a truck without cargo.

 

Demountable Rim Multi-piece steel wheel rim assembly which is bolted to a spoke hub. Demountable rims are still in use, though they have been replaced in many applications by the simpler disc wheel.

 

Disc Wheel Single piece rim/wheel assembly of stamped and welded steel or forged aluminum, anchored by 8 or 10 nuts to a hub. A "Budd wheel" is a ten-hole, stud piloted disc wheel; a design originated by the Budd Corporation.

 

Displacement (Piston Displacement) Sum of the volumes swept by an engine's pistons as they travel up and down in their cylinders. Based upon bore (diameter of cylinder) and stroke (distance traveled by piston). Expressed in liters  or cubic inches.

 

Doubles (Twins, Twin Trailers) Combination of a tractor and two semi trailers connected in tandem by a converter dolly.

 

Driveline All the components which together transmit power from the transmission to the drive axle(s).  These consist of at least one drive shaft (propeller shaft) with a universal joint at each end.

 

Drive train (Powertrain) All the components, excluding engine, which transmit the engine's power to the rear wheels: clutch, transmission, driveline and drive axle(s)

 

DRL (Daytime Running Lights) System that automatically turns on a vehicle's low beam headlights when the parking brake is released and the ignition is on...

 

Drop & Hook This means that you take your empty trailer into a shipper's facility and drop it. You then pick up a trailer that has already been loaded. It saves an enormous amount of time and most drivers find a company that has a high percentage of drop & hook to be a big advantage. (less dock time.) 

 

Transportation Terms - D

 

 

 

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