The Hitcher's a fab movie, you never know the remake might work (but no chance will it be as good as the original). Didn't C Thomas Howell make a sequel to The Hitcher a few years back?
Roadkill's great, it was the first film i saw out of that whole teen horror phase that actually scared me. I dont mind derivative films so much, as long as they're good. I prefer the name 'Roadkill' to 'Joyride' as well, suits the film better.