Car crash

So I just wanted to post here and get some opinions, I came into a car accident last night where 5 teenagers had struck a pole light. Fortunately they all seemed to be ok but i am sure they all will end up with some sort of spinal issues. I carry a med kit with me and have taken first aid classes and stop the bleed courses but when I got there I felt useless because all of my equipment was geared more towards an external traumatic injury and was of no use unless there was massive hemorrhage. Do any of you carry any other items in your car like a neck brace or the like? Are there other items I could carry that may have been useful? My limited first aid knowledge is nice and I made sure they weren't going to aggravate any spinal injury but I just wished I could have done more you know? Any suggestions on where else I could post are appreciated as well