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Class 8 includes what is considered the standard commercial vehicles, such as the single-unit dump trucks (with GVWR over 33,000 lb) and such trucks which usually have 3 or more axles. This includes the typical 5-axle tractor-trailer combination (also called a big rig, semi, or 18-wheeler) are class 8.
A couple of other things to consider, in the USA, the trailers will vary in length from 8 foot containers up to 57 foot van trailers, however, the 53 foot trailer is the most common, though there are different trailers for oversized loads and other purposes.
To operate a commercial vehicle, a Class 8 vehicle, in the USA requires the driver to have either a CDL Class-B for non-combination vehicles, or a Class-A CDL for combination vehicles (tractor-trailers).
Source: www.navistar.com
It is part of our national history
The history of the automobile is actually older than most people realize. But they weren’t very practical because the first ones ran on stream, which evolved into the railroads. But that didn’t stop inventers from trying to figure ways to design combustible engines that were practical for everyday use (and available to regular travelers).
