It serves as a gateway to the interior plains from Melbourne and surrounding settlements, and as such has developed as a major transport corridor, including the Hume Highway and a rail line, both of which are principal links between Melbourne and Sydney. It is also used by VFR flights on the Melbourne Inland Route from Sugarloaf Reservoir to Kilmore. The Bureau of Meteorology has operated a weather station known as Wallan (Kilmore Gap) since 1993. Located on the Kilmore Gap is Pretty Sally or Pretty Sally Hill.