Take photographs of the positions of the vehicles and the debris involved before the vehicles are removed. This can easily be done if you have a camera/camera phone. We also suggest a disposable camera kept in the glove compartment, along with pen and extra paper.
• Take photographs of the damaged areas on the vehicle and make cell phone recordings which can be used as evidence.

http://www.iaj-online.com/secure/wp-content/uploads/2016/01/Expediting-Motor-Claims.pdf