In some cities, such as Las Vegas, the police may not come out to make an accident report for minor crashes. Still, you want to report the crash to the proper authorities so that it can be documented for insurance purposes. A police report will help you when filing an insurance claim later on.
Next, take pictures of damage to any vehicles involved and also anything surrounding the crash site. Think of things that might be helpful were you to go to trial. This might include the other vehicle and signage such as speed limits, yield signs or other traffic signals.
Because you likely won’t be returning to an out-of-town crash site, document as thoroughly as possible right after the collision occurs.