Because it's springtime and birds are gearing up for nesting, they're less cautious then usual and will sometimes fly into traffic in a mating chase. Please be especially watchful when driving. If you do find an injured bird, don't handle it directly with your hands but use paper towels or some other barrier.
Links to wildlife rehabilitators:
U.S wildlife rehabilitators
(searchable by state)
Maryland wildlife rehabilitators:
Maryland Department of Natural Resources
1-877-463-6497 or 410-260-8940
*24 hour line that provides names and numbers of licensed wildlife rehabilitators
Maryland Wildlife Rehabilitators Association
(Directory of people who are certified in animal rescue -- sometimes you can bring an animal or bird directly to someone's house instead of a facility.)
Davidsonville Wildlife Sanctuary
Second Chance Wildlife Center
It is polite to offer a donation to help with the burden of expenses.