Corstorphine contains one of the busiest routes out to the west, and Glasgow Road's name reflects its former connection to that city. St John's Road, the main street in Corstorphine rather than the High Street, has been consistently rated as among the most polluted in Scotland. Lothian buses has introduced low-emission buses to try and deal with this problem. Large sections of this main road have been turned into bus lanes where the road is wide enough. Cycling routes run mainly from east to west as the topography is dominated by the ridge of Corstorphine Hill