Video Game Glitches - Rush 2

I remember how excited I was when I found this glitch (it's not often that I am the first to find a glitch). It really has no useful purpose just a cool way to get outside of the map.

Game - Rush 2
Console - N64
Level - Las Vegas
Difficulty - Very Easy

NOTE: It is possible to survive this and drive for a while underneath the map (I've done it before)