Due to their smaller and narrower profile, motorcyclists face a heightened risk of not being seen by drivers of other vehicles. In motorcycle crashes involving one or more other vehicles, another driver violated the motorcyclist's right-of-way in roughly two-thirds of accidents. A passenger vehicle making a left turn is the most common situation that results in motorcycle accidents. A motorcyclist is not seen, or not seen in time, and the passenger vehicle turns left in front of the motorcycle when it should have yielded. Overall, the bulk of motorcycle accidents arise from right-of-way failures at intersections during left turns or because of running a traffic signal or stop sign.