Obtain Information

In any accident, you should obtain the following information about:
The other driver: Name, address, driver's license number, insurance information, and license plate number.
Witnesses: Name, address, and telephone number.
Police officers: Ask the police officer's who investigate the traffic scene to provide you with a business card, with the "incident number," so that you can obtain an accident report. Most officers will provide this information to you, even if you don't ask.
The location: You may wish to take notes about where the accident occurred, the road conditions, speed limits, traffic control devices, the weather, and the lighting.
The accident: You may wish to take notes about how the accident occurred, such as the direction of travel of the vehicles involved in the accident, and what the cars were doing at the time of the collision.
Be aware that if litigation results from the accident, you may have to share your notes with somebody that you are suing, or somebody who is suing you