CityLink is a network of tollways in Melbourne, Victoria, Australia, linking the Tullamarine, West Gate and Monash Freeways and incorporating Bolte Bridge, Burnley Tunnel and other works.

Metropolitan Route 43 previously terminated at the Tullamarine Freeway/Calder Freeway interchange but it was extended along CityLink to end in Port Melbourne.

With Victoria's conversion to the newer alphanumeric system in the late 1990s, Metropolitan Route 43 slowly began transition to M2 and was finally replaced with M2 in 2018.

[10] Later in 2004, it re-declared the Tullamarine Freeway to terminate at Mount Alexander Road (sign-posted as Bulla Road) in Strathmore, south of Essendon Airport:[11] CityLink's Western Link officially begins east of this interchange in Strathmore, and ends with its interchange with West Gate Freeway in Port Melbourne.

[12] It included a new major bridge (the Bolte Bridge, named after former Victorian Premier Sir Henry Bolte) over the Yarra River in the Docklands district; a long elevated section over Dudley Flats and Moonee Ponds Creek and a tube-like sound barrier in Flemington where the road passes close to a number of community housing towers.

A short distance to the north of the sound tube, a massive sculptural work was placed, called the Melbourne International Gateway, consisting of a giant yellow beam hanging diagonally across the road (nicknamed the "Cheesestick") and a row of smaller red beams alongside the road (the "Zipper", or "rack of lamb").

The underground Southern Link directly connects the ends of the West Gate and Monash Freeways into one continuous through-way, for a total distance of 8.0 km.

The existing portion of South Eastern Freeway between Toorak Road and Batman Avenue was subsumed into the Southern Link, and was also widened.

The Exhibition Street Extension – not a part of the initial project, as it had been promoted as a bypass that would keep cars out of the CBD[14] – consisted of a new four-lane, divided road extending south from the intersection of Flinders and Exhibition Streets in the CBD and spanning the Jolimont rail yards to connect with Batman Avenue near Melbourne Park Tennis Centre.

Construction was managed by VicRoads on behalf of the Department of Infrastructure and began in November 1997, for a total distance of 1.9 km[15] completed to coincide with the opening of CityLink.

[16] The alignment of Batman Avenue, previously following the northern bank of the Yarra River north of Swan Street to terminate at Swanston Street just north of Princes Bridge, was re-routed to follow this new road; the route 70 tram, previously using this alignment, was also re-routed to run on a dedicated median behind the Melbourne Park complex and re-join the new road before it crossed the rail lines,[8] commencing along this new route from 7 June 1999.

In August 2015 a new proposal to widen the Citylink and Tullamarine Freeways was put into action by the recently elected Premier Daniel Andrews.

CityLink uses a DSRC toll system called e-TAG, where an electronic transponder is mounted on the inside of vehicles' windscreens.

Gantries constructed over each carriageway record registration plates and detect the e-TAGs, and deduct toll amounts automatically from the account linked electronically to each tag.

Where a tag is not detected, the vehicle's registration is recorded using an automatic number plate recognition system and checked against a database.

For infrequent use of the system one can buy a Daypass – by phone, online, at any Australia Post outlet or at participating service stations.

In 2018 CityLink tolling accounts were rebranded as Linkt,[24] as part of parent company Transurban combining their existing retail brands.

It was originally due to end in January 2035, but was extended as part of a deal with Transurban to build the West Gate Tunnel project.

[32] Some nearby roads were altered to restrict rat runs to stop people using neighbourhood back streets as short cuts to avoid the toll.

CityLink worked a way around the problem by adjusting the venting system which improved quality and dispersed exhaust fumes more effectively.