definition
strict definition
bumper cars
A designated space where small cars can be driven into one another for the amusement of drivers and passengers.
A facility for bumper cars is a space, usually a large room with an electrified ceiling, in which small cars can be driven and bumped into each other for the amusement of their drivers and passengers.
The cars are operated within a space intended for recreational bumping. Ordinary vehicle parking or road traffic has a different purpose.
A large room with an electrified ceiling is a usual arrangement, not a mandatory form. The recreational activity defines the facility.