sentence: Two bikers are riding their motor bikes through rough terrain. sentence:  They are dressed in biking gear with protective helmets and clothing. sentence: They are going on hilly slopes and uneven terrain on their motorbikes. sentence:  They go through extremely steep and dangerous dirt roads at high speed. sentence:  They also go over ramps created in the dirt road. sentence:  They continue biking through the dirt at high speed as they create a cloud of dust behind them.