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.