PC version Fans have made a PC version. Some are still early, so read the project page first.
Fans took Road Rash 64 apart and rebuilt it so it runs natively on a computer, often with widescreen, higher frame rates and mods. Here is the project we know about:
Unofficial Road Rash 64 PC recompilation with 60 FPS presentation, MAX LOD, widescreen, custom music and experimental multiplayer. Requires your own ROM.