What a wonderful moment! Nature's sanitation crew at work, despite the hazardous conditions!!!
Most raptors (eagles, hawks, falcons) we rescue that are hit by car were feeding on roadkill. This is why I stop for roadkill and move it a safe distance from the road, and encourage everyone else to do the same when safe to do so.
I encourage everyone to take the time today to find out WHO to call (and put in your cell) if you ever come across injured animals be they wild or domestic. It varies widely from state to state, country to country, and is rarely some government or municipal agency - but likely some private citizen or local volunteer society.
We also get a lot of "false alarms" as Birds of Prey feeding on roadside carcasses will mantle (spread their wings and hunch) over top a particularly tasty corpse they don't want to share. That said, I would ALWAYS prefer to go on a false alarm, then a rescue.
I also recommend grabbing one of those ugly pillow cases from the back of the
linen closet (you know the one(s) I mean) and even use a sharpie to write the number of your local group (s) on it. Then roll it up and wrap a couple of those fat rubber bands (from the mail or broccoli) around it before putting in your glove box in case you ever need to contain something or need a blindfold for a larger injured animal.
Today we had the honor of releasing two Barred Owls, both collided with cars (one in Nov, one in Dec), from the same 2blk stretch of road, called in by the same finder!!! Now, to be fair, the Barred Owls rarely get hit by cars, but are more likely to run into cars broadside as they are hunting rodents etc. under the convenience of urban streetlights, oblivious to passing cars.
I am extraordinarily lucky to reside on the Wet Coast of Canada where eagles are one of the most common large birds seen around. But, I have noticed they do LOVE to congregate at river mouths and ironically, the dump! If there is a dump nearby, you may find you can view these birds, rare in your area, with ease as they scavenge and predate on rodents.