Which type of surface could make a hot wheel car goes the fastest (ruiri)

which type of surface would make a hotwheel car goes the fastest

Aim
our aim is to see which type of surface would be able to make a hot wheel car goes the fastest like maybe a rocky surface that might be able to make the car slower

method
The method is to use a hot wheel car that is the same but in different surfaces and check the speed by using a speedometer

Hypothesis
our hypothesis would be that a clear surface woul be the one that make the hotwheel car goes the fastest