If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You'll have to drive the car to take it to the finishing point to score more points. The car comes to a halt after the power given by all the five gears get utilized. You'll have to use the mouse to drive the car when it comes to a halt, as you should also avoid the other vehicles to reach the finishing point, which is a total distance of five kilometers. As you go past each kilometer, your point increases. In case you get hit by another vehicle, the game comes to a halt.