On a recent trip to Brooklyn I took 4th Avenue down to Park Slope and then 5th Avenue back to the Verrazano Bridge.
Both avenues take you through Bay Ridge and Sunset Park, down to Park Slope and on to Downtown Brooklyn and the court district.
4th Avenue is a busy 6 lane thoroughfare; 2 lanes in each direction and 1 parking lane on each side.
5th Avenue is one lane is each direction and is a huge shopping area.
and then I had to wait to go home to NJ