Slang used by commercial drivers/truckers to describe reckless, dangerous, and ignorant drivers who operate motor vehicles on four wheels (hence the name) such as cars, SUVs, vans, and pickups. Common behaviors of 4-wheelers include
tailgating/bunching, blocking merges, improper lane usage, veering out of lanes, being glued to their mobile phone, illegal and unsafe passes,
excessive horn usage, brake checking, and accident/
insurance fraud.