The split between the CRB and the MMBW when building freeways was an interesting period – it remained in place until the shakeup that was the Transport Act 1983.

With provision of wide overpasses for future widening was interesting – I’m struggling to think of other Melbourne examples.

THE MMBW sections had their own distinctive standards compared to CRB for bridge railing, sign gantries and street lighting – notably the low pressure sodium tubes that lit up in an amber colour for the inner section of the Tullamarine and South Eastern
http://mrv.ozroads.com.au/freeway_routes/F81N/pics/70-2890.jpg
http://mrv.ozroads.com.au/freeway_routes/F80/pics/76_03006_07.jpg

Both were built in waterways to get the land with minimal acquisition and in the case of Moonee Ponds Creek it was both straightened and channelised – it used to wind around between Brunswick Road and Mt Alexander Road, as well as behind Moonee Valley Racecourse which lost its chute…
http://melwayed1.melway.com.au/029.jpg

The major property acquisitions were around Moreland Road – Coonans Road which was realigned, as well had between Pascoe Vale Road and Napier Street where Hood Street and the houses either side made way for the freeway. At the city end Flemington (Upfield line) bridge was extended to allow for the extra lanes feeding in on the northern side

The overpasses from Essendon Airport in were initially planned for 4/5 lanes each way with the initial 2-2 lanes built together either under one side or in the middle as at Brunswick Road above. They will have maxed out with the 5th lane widening and even there it being a squeeze under the Moreland Road overpass inbound.
https://www.google.com.au/maps/@-37.7514685,144.9354236,3a,75y,151.99h,86.27t/data=!3m7!1e1!3m5!1sqq25UtSZqKJmb6pCLESxKw!2e0!6s%2F%2Fgeo1.ggpht.com%2Fcbk%3Fpanoid%3Dqq25UtSZqKJmb6pCLESxKw%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D45.668713%26pitch%3D0!7i13312!8i6656