1989 – Gisborne bypass opened 17 March 1989. The 6 km bypass cost A$25m. 1990/1991 – Oakbank Road, Keilor North to Duncans Lane, Diggers Rest. 7.7 km of newly duplicated '2 lane carriageway' opened to traffic at a cost of A$14m. No exact date was given, however VicRoads Annual Reports cover the previous financial year. 1991/1992 – 2 km of duplication completed at Ravenswood during 1991/1992 at a cost of A$1.3m. 1993 – Diggers Rest bypass. $A32m 6.5 km bypass opened to traffic in July 1993, followed by the Vinyard Road interchange in November 1993. 1994 – Ravenswood section. Duplication of the highway completed 'in 1994' 1995 – Kyneton bypass opened to traffic in April 1995, at a cost of A$31m. 1996 – Gap Hill section (Diggers Rest to Millett Road). Opened in May 1996, at a cost of A$32m. 1998 – Gisborne South to Gisborne. 6 km completed at a cost of A$31 and opened to traffic on 3 April 1998. 2000 – Gisborne to Woodend (Black Forest section). 6.8 km section opened to traffic on 17 March 2000. Completed at a cost of A$51m. 2001 – Woodend bypass. 13.5 km bypass opened to traffic on 19 December 2001. The total cost of the project was A$85m. 2003 – Carlsruhe section. 6.5 km section opened to traffic on 16 April 2003, at a cost of A$46m. This section completed the dual carriageways from Keilor to Kyneton. 2005 – 2.5 km north of Kyneton completed in January 2005. 2005 – Ravenswood. 6.5 km duplication south of Ravenswood completed in May 2005 2008 – 15 km Malmsbury section opened in April 2008. 2009 – Harcourt North to Elphinstone opened on 20 April 2009. This 19 km section cost A$404m and completed the duplication of the highway between Melbourne and Bendigo. The project was jointly funded by the state and federal governments. 2012 – Kings Road interchange, opened in January 2012, at a cost of $62 million, jointly funded by state and federal governments. 2018 – Ravenswood (Calder Highway, Calder Freeway and Calder Alternative Highway) interchange, reconstruction started May 2016 and completed in March 2018, at a cost of $86 million, jointly funded by state and federal governments. 1969 Melbourne Transportation Plan The Calder Highway between the Melton Highway and the Western Ring Road is shown in the 1969 Melbourne Transportation Plan as part of the F4 Freeway corridor, which extends past