it seems a really clever chap was able to port the laser disc version of road blaster into the snes,not only did he was able to pull something as awesome as this but the port some says looks better then the sega cd version!
the Rom is around 400Mb and is consider the biggest snes rom there is.
to play you need a special snes cart or an emulator,the only emulator capable of this is Bsnes which has become Higan.
more info here:
http://www.assemblergames.com/forums/sh ... -SNES-port
http://www.destructoid.com/super-road-b ... 8189.phtml
http://www.retrocollect.com/News/fmv-su ... enger.html
Enjoy