I highly recommend watching this video starting around 1:00 and watching to the end because somebody got super-clever with this Back to the Future mod for Crysis. I don't want to ruin it for you, but it's freaking awesome. Like the first time you ever rode down carpeted stairs on a baking sheet. (But less concussion-y)
Thanks to Antonio, who doesn't need roads where he's going because he owns a jetpack. JEALOUS!