From Arlington, Virginia, via Route 50 East
Follow route 50 East to the Theodore Roosevelt Bridge.
Cross the Roosevelt Bridge, and follow signs to Constitution Avenue.
Continue on Constitution Avenue.
Turn left onto 17th Street.
17th Street turns into Connecticut Avenue. Continue on Connecticut Avenue until you reach the 3000 block. The National Zoo will be on your right at 3001 Connecticut Avenue.
Leaving the Zoo:
Turn left onto Connecticut Avenue:
Continue on Connecticut Avenue to 17th Street. Connecticut Avenue turns into 17th Street.
Turn right onto Constitution Avenue:
Follow Constitution Avenue to the Theodore Roosevelt Bridge.
Cross the Roosevelt Bridge, and follow signs for route 50 West.
