It is on the side of the road and not moving away from traffic. It is seriously injured. If it can be captured easily. If a bird is all puffed up and hasn't moved. An adult bird cannot fly or flies poorly.
Wild animals are dangerous and can carry disease.
Pick the animal up with a towel or gloves and place in a towel-lined box. Make sure the box is large enough, but not so large that the animal can thrash around in it. Put the box in a warm, dark, quiet place.