I've been in an accident, what should I do ... ?
If you are able, call 911.  Then offer aid to others if possible.  Get out of the roadway, stay away from the vehicles.  Resist the urge to return to your vehicle for personal belongings until directed to do so by emergency personnel.   Know the law in your jurisdiction on moving your car prior to the arrival of a law enforcement officer.  If possible collect as much information about the the other party(s) involved such as;  license plate of vehicle(s), names, addresses and phone numbers of involved party(s) or witnesses.  A disposable camera may be a good idea to keep in the glove box for photographs of damage and evidence.