Drivers often fail to see motorcycles. It sounds so simple, and so easily avoidable, but it happens all the time. It also leads to serious accidents. Drivers who don't see motorcycles may cut them off, turn in front of them, merge into them on the interstate or cause crashes in numerous other ways.
Distracted driving accidents are all too common these days, and part of the reason is that people just don't understand the problem. For instance, did you know that thousands of people die in these accidents every year? They're by no means a minor problem.