You should take the same steps as you would after any other car accident—namely, you should seek out medical attention as soon as possible to rule out any injuries that might not be immediately apparent. Assuming your injuries were not severe, you should document the scene of the accident to the extent possible by taking photos of the crash and any injuries, obtaining information about the driver (a badge or license number, vehicle license plate number, etc.) and the contact information of any witnesses. Call an experienced public vehicle accident lawyer as soon as possible, we may even be able to come to the scene to begin conducting our investigation immediately so as to gather the strongest possible evidence in your case.