The Tun Dr Lim Chong Eu Expressway runs along the eastern coastline of Penang Island between the city centre and the Penang International Airport, linking both locations with the Bayan Lepas Free Industrial Zone and the Penang Bridge. The George Town Inner Ring Road and the Penang Middle Ring Road are the two major ring roads around the city centre. The city centre is also linked with the western parts of Penang Island, such as Balik Pulau, via the pan-island Federal Route 6.