From the MSF:

I think this would be a great piece of information to share with everyone you know
(especially beginning drivers).
1  Over half of all fatal motorcycle crashes involve another vehicle. Most of the time, the motorist, not the motorcyclist, is at fault. There are a lot more cars and trucks than motorcycles on the road, and some drivers don’t “recognize” a motorcycle – they ignore it (usually unintentionally).

2  Because of its small size, a motorcycle can be easily hidden in a car’s blind spots (door/roof pillars) or masked by objects or backgrounds outside a car (bushes, fences, bridges, etc). Take an extra moment to look for motorcycles, whether you’re changing lanes or turning at intersections.

3  Because of its small size, a motorcycle may look farther away than it is. It may also be difficult to judge a motorcycle’s speed. When checking traffic to turn at an intersection or into (or out of) a driveway, predict a motorcycle is closer than it looks.

4  Motorcyclists often slow by downshifting or merely rolling off the throttle, thus not activating the brake light. Allow more following distance, say 3 or 4 seconds. At intersections, predict a motorcyclist may slow down without visual warning.

5  Motorcyclists often adjust position within a lane to be seen more easily and to minimize the effects of road debris, passing vehicles, and wind. Understand that motorcyclists adjust lane position for a purpose, not to be reckless or show off or to allow you to share the lane with them.

6  Turn signals on a motorcycle usually are not self-canceling, thus some riders (especially beginners) sometimes forget to turn them off after a turn or lane change. Make sure a motorcycle’s signal is for real.

7  Maneuverability is one of a motorcycle’s better characteristics, especially at slower speeds and with good road conditions, but don’t expect a motorcyclist to always be able to dodge out of the way.

8  Stopping distance for motorcycles is nearly the same as for cars, but slippery pavement makes stopping quickly difficult. Allow more following distance behind a motorcycle because it can’t always stop “on a dime.”

9  When a motorcycle is in motion, see more than the motorcycle – see the person under the helmet, who could be your friend, neighbor, or relative.

10 If a driver crashes into a motorcyclist, bicyclist, or pedestrian and causes serious injury, the driver would likely never forgive himself/herself.

Citation:  www.forcardrivers.com/quicktips.html
MSF Motorcycle Safety Foundation