The role of the built environment in influencing demand for public transport is recognised. However little attention has been given to understanding the built environment factors associated with demand for specific modes, like train, tram and bus. This thesis aims to explore the built environment impacts on transit use by mode. A review of prior research and empirical studies in three cities (Melbourne, Amsterdam and Boston) are undertaken to fulfil this aim. Results suggest some of the built environment predictors of transit use are important for all modes, however others appear to give a selective boost to specific modes.