This chapter of the guide to Car Mechanic Simulator 2021 describes the Speed Track. You will read about the abandoned airport and learn how to test a car's maximum speed.
Available: since the beginning of the game
The Speed Track is the abandoned airport, where you can check the maximum speed of the selected car along the entire length of the runway.
As always, you can change the camera view with the C key.
Note - the road ends at some point. You can turn and accelerate in the opposite direction, or turn left and circle back around. Then you can explore the entire airport with airplane wrecks and hangars.