Typically, this length comes from the semi-truck's frame, or the extended steel section towards the truck's rear that supports the majority of the wheels and cargo.

There's a good reason why most of the semi-trucks on the road are rear-wheel drive. The alternative doesn't make much sense once you consider usage.

UPDATE: April 30 at 7:25 a.m. A LEX 18 crew on the scene reports that I-75 southbound near mile marker 71 is back open after a semi-truck collision had the roadway closed for several hours overnight.

A Detroit Diesel DD15 14.8-liter inline six-cylinder engine weighs 2,880 pounds, or 345 pounds more than a Mini Cooper. This colossal power plant makes up to 560 hp and 1,850 lb-ft of torque, and ...