* Engine roar/hum: A characteristic sound produced by the engine's combustion process. This can vary from a low rumble to a high-pitched whine depending on the engine type and speed.
* Exhaust note: The sound produced as exhaust gases exit the tailpipe. This can be a deep rumble, a throaty growl, or a high-pitched whine depending on the car's design and exhaust system.
* Tire noise: The sound of tires rolling on the road surface, which increases with speed.
* Wind noise: Air rushing past the car at higher speeds.
* Braking squeal/grind: Sounds produced by the brakes, usually indicating wear or a problem.
* Clicking/knocking: Sounds that can indicate engine problems.
So there's no single answer, but a combination of these sounds is typical.
