I feel your pain - I drive past dead cats a few times a week. I actually keep trash bags and latex gloves in the boot now, and if I can safely pull over (and they are not too badly squashed) I retreive the bodies and drop them off at our shelter. You should SEE the looks I get from other drivers! I have some horrible images in my mind of cats I have picked up - but it beats driving past every day and seeing them getting more and more squashed

I'd say 99% of those are strays (as we have a constant epidemic of stray cats here) but I have picked up one with a collar - at least if the owners checked with the shelter they would find out what happened, and not be left wondering - but that's ONE at least that could have been saved by being kept inside !