I think it should be vroom vroom. There are several onomatopoeias for it.
Beep Beep!
Car honks sound like beep beep because the purpose of car honks is to gain attention. The beep beep is just one sound that grabs peoples' attention when one needs it in the car.
The truck's horn has not evolved beyond the beep. But it's improved since the toot and the ah-oo-gah or generations past.
Little Go Beep was created in 2000.
BEEP! BEEP!No seriously, the road runner actually has a "coo" sound similar to that of a dove.
It will sound an alarm through the receiver that goes beep beep beep.
If the computer passes the POST the computer will have a single beep
A word that suggests the source of the sound that it describes. Like beep beep for the horn of a car.
beep
"Beep, Beep" (the Little Nash Rambler).
Little Go Beep - 2000 is rated/received certificates of: USA:G (certificate no. 36820)