The Airport Link is a tunnelled, motorway grade, toll road in the northern suburbs of Brisbane, Queensland, Australia. It connects the Brisbane central business district and the Clem Jones Tunnel to the East-West Arterial Road which leads to the Brisbane Airport. It was built in conjunction with the Windsor to Kedron section of the Northern Busway in approximately the same corridor. The Airport Link and busway project involves 15 kilometres (9.3 mi) of tunnelling including the road (6.7 km of twin tunnels), busway tunnels and connecting ramps, as well as 25 bridges and result in over 7 kilometres (4.3 mi) of new road. The Airport Link is Australia’s longest road tunnel. The estimated construction cost of the Airport Link is $4.8 billion.