BBC Distance from a truck's front bumper to the back of its cab.

Bill of Lading A shipping document or or shipping paper for a particular shipment.  It contains an itemized list of goods in the shipment. It serves as a contract of shipment and a receipt for the goods.

Blind Spot Areas around a commercial vehicle that are not visible to the driver either through the windshield, side windows or mirrors.

Bobtail Tractor operating without a trailer.

Bogie (also spelled bogey) Assembly of two or more axles, usually a pair in tandem.

Balloon Freight The term used when a driver is hauling cargo that is very light in weight compared with the cubic space occupied.

Brake Horsepower (bhp) Engine horsepower rating as determined by brake dynamometer testing. (see Horsepower)

Bridge Formula A bridge protection formula used by federal and state governments to regulate the amount of weight that can be put on each of a vehicle's axles, and how far apart the axles (or groups of axles) must be to legally carry a given weight.

Bulk Freight Freight that is not in packages or containers.  It is normally hauled in tanks or grain trailers.