To begin accelerating, press up or down. To use the brakes, press the keys for the opposite direction. To start accelerating again, you need to let go first. Use the left and right arrow keys to steer. Your MPH is shown in the bottom. If you the camera looks glitchy and the car is moving choppy, set smooth camera to 0. Press space to turn on cruise control. Then, click set speed and set the speed you want. You will only be able to steer, the car will control its speed. To control the speed again, press space to turn it off.
This is a much improved version of the original. The controls and braking are now more realistic, and it has a much smoother, nice looking camera and the car even has a shadow! Also, the original had incorrect MPH shown at the bottom because it was done wrong. I'm still not sure if it's correct, but I tested it a few times and checked what was used to find it, and it should be alright.
