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You can widen that section of the freeway as much as you could widen the GFF tunnel (none), but like the GFF tunnel, the emergency stopping lane can be used as an additional traffic lane under the managed motorway scenario above.
The present traffic problems with the existing Roe highway/Kwinana freeway intersection relate to capacity constraints to the south. That's being addressed southbound with the Kwinana carriageway widening under way. Northbound will also have to be done at some point.
The current Roe highway/Kwinana freeway intersection is certainly a nightmare is in terms of design options to extend Roe Highway further west. You can see from the following link the number of bridges that have to be built for Roe8 and utilise the existing bridge. That's the northermost of the 3 bridges shown going over the Kwinana Freeway.
http://www.southmetroconnect.com.au/wp-content/uploads/60100953-215J-CI-DRG-0027-RevB.pdf
I agree with you doc, but I think the emergency stopping lanes are what is being removed at the moment.
It will only be a matter of a couple of years and the situation will be back to where we are now.
The rail line takes about six lanes of capacity away, it is only a matter of time before it has to be utilised.
As for the Armadale line, trains run every 15 minutes, this can be increased, also the rail easement has enough space for a dedicated line.
I know the Mandurah line on the foreshore is a lovely trip and experience, however in demographic terms it would have been better servicing Welshpool and Canning Vale.
Mandurah has high unemployment and Welshpool, Canning Vale are industrial areas, therefore require workers.
My personal belief is, the rail link through Canning Vale will be put into service, and the Perth - Cockburn line will have to be sunk or raised.
It was nothing more than a political vote catching scam, that will cost heaps to rectify and cause a huge headache for everyone South of the river.
No doubt the east west tunnel, would circumvent traffic issues that will no doubt manifest themselves, as the population increases in Melbourne.
Labor tend to go for sugar fix, instant hit politics, that end up costing everyone heaps later.
But it does sort out peoples pensions.IMO