Riding a motorcycle presents a series of unique risks that other motorists don't have to contend with. Since motorcycles are the smallest road-legal form of transportation, they are more easily obscured by other vehicles on the road or bad weather, making them a much harder target for motorists to spot. Most drivers of cars and trucks also lack the understanding of how a motorcycle moves, and may be more likely to incorrectly predict their motions on the road. Additionally, hazards like potholes, uneven roads, oil slicks and general debris can pose a serious threat to the stability of a motorcycle. Many riders also underestimate the considerable skill and coordination required to drive a motorcycle, and may overstep their limits and get into an accident.