Is this a Sign

I am not sure if I believe in signs or random events that are sent from some higher power to motivate you to some course of action.  But sometimes it seems like nature is trying to tell me something.

As I was stuck at a light on Elmwood near the Art Gallery, I saw something in the opposite lane outside my window.  On focusing, I noticed a small sparrow in the middle of the road.  It's mouth was open and it looked as if it could not move.  His little leg seemed wrong. As I am trying to figure it out, a bus came and ran directly over it.  Shocked, it was not touched by a tire.  Until of course a pick up came and completely smashed the bird.  At that point the light had turned and I was being ever so gently encouraged to move by a symphony of car horns.

I am not an animal person, but this was horrific.  How was I in just the right place and time to experience it?  Shouldn't I have done something?  If I threw the car in park and walked into opposing traffic to pick up a bird, would I have caused an even worse accident?  How would I have picked it up and what would I have done to help it?  Maybe I should just let Darwin's laws operate as they will.

Somehow I think this is a sign, but I am not sure the meaning.  It could be nature telling me to act - to do something - or be killed.  Hmmm ...  or maybe it's just a sign like the bumps and scratches on my car telling me to pay attention to traffic while I am driving, instead of contemplating nature.