Tower Bridge bridge's upper walkways. The pedestrian walkways are above the river at high tide. The main bridge deck carries two lanes of road traffic between two low-level pedestrian walkways across both suspension spans and the opening bascule section of the bridge, with the walkways separated from the roadway by fences. The roadway passes through each of the two towers, whereas the low-level walkways pass around the outside of the towers. One of the chimneys on the bridge, which are often mistaken for lamp posts, connects up to an old fireplace in a guardroom of the Tower of London. It is long-disused.
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