It has two levels. The upper level has 4 lanes of vehicle traffic and provides a excellent view of the bridge's cantilever truss structure and the New York skyline. It was formerly used for the BMT Subway's trains. The lower level has 6 lanes, 4 for vehicle traffic and 2 outer lanes, which are used for either vehicle traffic or pedestrians and bicycles.
The Queensboro Bridge consists of several spans, one crossing over the East River, another over Roosevelt Island, and another over the river on the other side of the island.