Use the up arrow to accelerate and the left and right arrows to turn. This is just a test to see if I am able to make a multiplayer racing game like this. I wasn't able to do it my preferred way, but this should work somewhat. If you press the back arrow to go in reverse, you will maintain that speed, and nothing will slow you down.
Credit to @GreenConsole for the car graphics. This is just a test. --UPDATES-- Multiplayer Racer v1.1 - This version calculates the position of the racers, and the direction. Not sure yet if it works yet. Multiplayer Racer v1 - This is the initial release of the game. I am calculating the direction of the racer, and the velocity of the racer. I ran into a problem with this, where the player would go to the edge of the screen, an the other computer would see this, and then the player would slide and mess up the other computer's visual of him. He would get to the finish line on his computer, but on the other player's computer, it looked as if he hadn't gotten to the finish.