The Windows Phone Marketplace has several motor cross games where you can hit the dirt roads (MotoX Mayhem, Bike Mania, etc) . But what about those who prefer the flat top? AE 3D Motor is a motorcycle oriented game for your Windows Phone that has you racing up the highway, weaving in and out of traffic.
You race for as long as you can without crashing into a car, truck or semi. The further you go the higher the score. If you like motorcycle racing games and have a few minutes to blow, AE 3D Motor isn't a bad choice.