Speedometer and Speed Glitch

The Speedometer is the device which notifies you at what speed are you travelling. Much like the Penalty and Time boxes, the numbers in the yellow box on the speedometer are outside of their boxes if you go fast enough.

At top speed, your truck can only travel at a measly 80 miles per hour. But if you stop and hold the "reverse" key, the speedometer will travel clockwise and keep travelling clockwise, passing the highest speed on the display. The needle will continue to go around and around, the speed climbing higher and higher, and the sound of the engine getting higher pitched as the speed increases.

If you have the nerve, you can keep pressing the key, as demonstrated by a YouTube user, for 50 minutes, and as your truck is reaching speeds faster than the speed of light, will come to a certain speed. That speed, found out to be 12.3 undecillion miles per hour (1.23E37), caused all of the checkpoint lights to all light up green, and since all the lights are lit up, the game thinks that you have crossed the finish line, and will display the infamous "YOU'RE WINNER" screen.

When the truck reached 12.3 undecillion mph, the game thinks that you are everywhere at once, thus lighting up all checkpoints on the Ultranav.

Also, while travelling at these unachievable speeds in reality, by releasing the reverse key, your truck will stop on a dime.