If you find yourself in this situation, there are a few steps you can take to help protect your health and your potential claim.
Call the police to report the accident—Officers know how to deal with multi-car crashes and will hopefully respond quickly. They will also file an official accident report that can help to support your case.
Exchange information with all parties involved.  If possible, take photos of everyone's ID and insurance cards.
Take photos at the scene. With multiple vehicles involved, photograph the crash damages and locations.
Obtain witness information.  If an independent witness is at the accident location, take there information. They might not wait until police arrive.
Assess your injuries and take proper medical precautions—let someone know immediately if you need to call an ambulance. If your injuries do not seem urgent, it is still essential to seek medical attention as soon as possible. Sometimes symptoms don’t show up for hours or even days after the initial impact. For example, whiplash is a serious injury that might not be apparent directly after the accident but can become incredibly painful and be debilitating shortly after.
Contact a pile-up accident attorney in Chicago. Do this before speaking with any insurance adjuster. With multiple automobiles, issues can get confusing fast.