A tractor is a large vehicle used on farms to pull or push heavy farming equipment and other machinery. It helps with tasks like plowing fields, harvesting crops, or moving heavy materials. Full definition
The most noticeable difference is that tractor trailer trailers are much larger in size as well as weigh much more than cars, SUVs, or smaller - sized pickups. (memphiscochran.com)
Owners of tractor trailers have several coverage requirements and need specialized insurance. (trustedchoice.com)
We estimate, for example, that we can increase fuel economy by as much as 25 percent in tractor trailers using technologies that already exist today. (dotearth.blogs.nytimes.com)