Bridge four-lane highway on the upper level and a pair of railway tracks at the lower level. Tower Bridge in London is different example of a double-decked bridge, with the central section consisting of a low level bascule span and a high level footbridge. A viaduct is made up of multiple bridges connected into one longer structure. The longest and some of the highest bridges are viaducts, such as the Lake Pontchartrain Causeway and Millau Viaduct. A three-way bridge has three separate spans which meet near the center of the bridge. The bridge appears as a "T" or "Y" when viewed
Parks and open spaces in the London Borough of Tower Hamlets and one of the largest open spaces is the Thames itself. A sign posted riverside trail exists from Tower Bridge, in the west, around the Isle of Dogs, and leaving the borough at the crossing of the River Lee. Although planning procedures have tried to open and protect access to the river, often private developers have locked gates and otherwise prevented access to what should be public areas. There are otherwise, public stairs providing access to the foreshore. Parks and open spaces in the London Borough of Tower Hamlets The London Borough of Tower Hamlets, in spite of being close