Your safety is just as important as the animal's!
When you're trying to save an animal, the last thing you want to do is put yourself in danger. Trust me, if you get hit by a car, no-one is going to be trying to save the pigeon you found in the road, they're going to be trying to save you!
If you're dealing with a casualty on a busy road, please contact the local police for assistance. Remember not to put yourself in danger!