these being transit lanes) and extending it south to the West Gate Freeway at Port Melbourne. The improved sections, starting east of Bulla Road, were subsumed into CityLink as the northern half of the Western link, and are now tolled. Lancefield Road was signed as Metropolitan Route 40 between Essendon North and Tullamarine in 1965, with Metropolitan Route 40 continuing north along Sunbury Road to eventually terminate in Bulla. When the Tullamarine By-pass Road opened in 1968 between Essendon Airport and Tullamarine Airport, Metropolitan Route 40 was re-routed onto the new freeway. It was re-routed again from Bell Street onto the Strathmore By-pass Road section of the freeway, once it and the Bell Street interchange opened in 1970. Once the Tullamarine Freeway southern extension opened in 1970, the entire freeway from Tullamarine to Travancore was signed as Freeway Route 81, sharing concurrency with Metropolitan Route 40 from Tullamarine to Pascoe Vale South, and also another concurrency with National Route 79 from Essendon North to Travancore once the Calder Freeway bypass of Niddrie opened in 1972. Metropolitan Route 40 was re-routed onto Calder Freeway in 1989: Metropolitan Route 43 replaced it from Essendon North to Tullamarine in 1989, while Freeway Route 81 was abolished in the same year. When CityLink opened in 1999, Metropolitan Route 43 was extended along the entire freeway, including the Western link, to its end in Port Melbourne. With Victoria's conversion to the newer alphanumeric system in the late 1990s, the vestige of National Route 79 was finally abolished in 2013 (Calder Freeway had already converted to M79 in 1997), and conversion of Metropolitan Route 43 to route M2 began, finally completed in 2018. The concurrency with Metropolitan Route 40 was abolished in 2020, when it was re-aligned to terminate at Bell Street interchange. The freeway is used by SkyBus services to Melbourne Airport, and in 2002 the Victorian government contributed $3 million to a $10 million plan to expand and improve these services, after a feasibility study into an airport rail link found the number of passengers using a train would not make the scheme economically viable. The passing of the Road Management Act 2004 granted the responsibility of overall management and development of Victoria's major arterial roads to VicRoads: in 2004, VicRoads re-declared Tullamarine Freeway (Freeway #1810) from Melbourne-Lancefield Road (today Sunbury Road) at Melbourne Airport to Mount Alexander Road (sign-posted as Bulla Road) in