Look at these pictures for a fantastic picture tutorial on how to get on the road in waverider. No writing should be required for the tutorial.
[url=http://img27.imageshack.us/gal.php?g=combatarms01m.jpg]ImageShack® - Gallery[/url
First go to the little room in Alpha side of waverider, go up on the ledge, and just before you are about to start sprinting, quickly click the right button while you are running, if it gets hard, click the Screenshot/Prnt Scrn/Print Screen Button, and it should lag a bit, but eventually get you there, jump down, now be heaps careful not to fall or to go to far on the left, try and jump from ledge to ledge, careful when it gets narrow! After you get there, usually after a few tries, walk around to the edge and walk out a bit, and then sprint up a few times, and you will eventually get there, you can see everyone, but no one can see you or kill you(unless they are up on the road too), but be careful not to accidentally fall down, otherwise you'll have to do the whole thing again!
Enjoy!!!

(By doing this, I do not take any responsibility for any trouble or bad cause this of this glitch)