Fine, but we've asked how on earth does your foot get high enough to hit anything other than a tyre...?
Then, watch as a car drives by you at 30, and imagine how fast/hard your foot would have to be moving to not get caught by the front of the car, but to do damage to the side...
Anyway, this is getting kinda pointless. As we've said, be very careful. It seems very odd to us, so it will to the police.
Personally I don't think there's much need of taking pictures of the speed limit, that's not what's being investigated. I hear it at work a lot "Yeah, but what about person X, they did X,Y andZ!" ... "They may well have, I'll deal with that separately. Right now we're talking about why you did A,B and C"
So maybe it was the tyre.......
Again, the car made contact with my foot. You are making an assumption that my foot caused any damage.