The Perth Central Area Transit system, or simply CAT, consists of five bus routes in the centre of Perth and three bus routes in Joondalup. CAT services formerly operated in Fremantle, and similar services exist in Rockingham and Midland. Unlike all other Transperth services, most CAT routes are free.

Joondalup is a suburb of Perth, Western Australia, approximately 26 kilometres (16 mi) north of Perth's central business district. It contains the central business district of the regional City of Joondalup and acts as the primary urban centre of Perth's outer northern suburbs.