The Washington Avenue Bridge crossing the Mississippi River provides access between the East and West Banks, on foot and via designated bike lanes and a free shuttle service. The bridge has two separate decks: the lower deck for vehicles and the newly constructed light rail, and the upper deck for pedestrian and bicycle traffic. An unheated enclosed walkway runs the length of the bridge and shelters pedestrians from the weather. Walking and riding bicycles are the most common modes of transportation among students. University Police occasionally cite individuals for jaywalking or riding bicycles on restricted sidewalks in areas surrounding the university, resulting in fines as high as $250. This is often done at the beginning of a school year or after pedestrians interfere with traffic.