It's short for "semitrailer". The entire rig is properly called a tractor-semitrailer. It's a semitrailer because it's only part of a trailer; it only has the back set of wheels (the front wheels under the cargo area are attached to the tractor, the part with the engine and the driver's cab).
Progressive and Travelers is the company witch has truck insurance for 18 wheelers. They have the best quotes on the insurance you may find they on the internet and call to this company.
Yes, 18 wheelers have 18 wheels.Some tractor trailers have more, some less.
The statistics are not broken down by that category (i.e.: 18-wheelers, 10-wheelers, 6-wheelers, etc.). They are all classified as "commercial" vehicles.
# no way.
Some of them do.
The Texas Wheelers - 1974 The Call 1-7 was released on: USA: 17 July 1975
Yes
No.
If you mean cruise control, yes.
Steel or aluminum.
Two or more.
1.2 million