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.