Is it standard Motocross bike racing or are there also some Road Rash elements thrown into this game?
No
, imagine an overhead racing game like MicroMachines Racing (NES) but with prize money, parts management (upgrades) and special "items" (purchased) over the course of the competition.
MicroMachines is a superior game (addictive as hell and nice controls), but I've had lots of fun with MotoRoader. Unfortunately, I think MR is an acquired taste and that it won't impress too many folks.
Bonus: Fantastic chiptunes! Truly.