The drawbridge would be 84 meters long and would be the first tilting bridge (which is the technical term, dontcha know) on the Thames since Tower Bridge was built in 1894. Plans include separate paths for cyclists and pedestrians, to avoid any conflict Of switching. The architects estimate that it would cost about 88 million pounds sterling and would take up to five years to build. A drawbridge or bridge is a type of mobile bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as swing bridges, vertical bridges and hanging bridges, but this article refers to the narrower, more historic definition Of the term.