This info comes from
http://www.cs.amedd.army.mil/iso/MAP...otorCycle.html
I hope it is helpful
There are more than 4 million motorcycles registered in the United States which represents about two percent of all vehicles registered, yet motorcycle fatalities represent about five percent of all highway fatalities each year. About 80% of reported motorcycle crashes result in injury or death compared to about 20 % for automobiles.
The failure of motorists to detect motorcycles is the most frequent cause of accidents for motorcyclists. More than one half of motorcycle accidents occur because the driver simply "did not see the motorcyclist coming." Automobile drivers contribute to another 10% of motorcycle accidents where the motorcycle is the only vehicle involved. Drivers who unintentionally pull out in front of a motorcycle often force the rider to over brake, slide, and fall. Motorists tend to look for other cars, not for motorcycles. In addition, because of its small profile, a motorcycle is harder to see. A motorcyclist's riding pattern also differs from that of a car and is harder to judge and predict. Traffic, weather, and road conditions often require motorcyclists to respond differently than drivers.
Left Turns: The most common accident between cars and motorcycles is at an intersection when the automobile driver is making a left turn in front of a motorcycle. Over forty percent of all motorcycle accidents occur at intersections.
Car's Blind Spot: Cyclists riding alongside a lane of cars are often out of the view of the driver. An unsuspecting driver may collide with a motorcyclist as the driver changes lanes.
Hazardous Road Conditions: Motorcyclists have to be much more concerned about road obstructions. Potholes, fallen tree limbs, or railroad tracks may be minor problems for many drivers. A motorcyclist may have to slow down or change lanes to avoid these obstacles.
Weather Conditions: When the road surface is wet or icy, motorcyclists' braking and handling abilities are impaired
Strong Winds: A strong gust of wind can move a motorcycle across an entire lane if the rider isn't prepared for it. Wind gusts from large trucks in the other lane can be a real hazard.
Large Vehicles: A large vehicle, such as a van or truck, can block a cycle from a driver's view. The motorcyclist may seem to suddenly appear from nowhere