Reposting the concept from the other thread.
I am in favour of a creative solution for the Vanier Parkway extension.
Regardless of other bridges, traffic from A-5 will always funnel from the M-C bridge. The Parkway extension can take away half the traffic from King Edward, leaving only the cars destined for downtown. It could remove the downtown truck problem in the most cost effective way, and it can be done with zero net loss of parkland:
Instead of pedestrian ramps, there could be berms on the river side rising to the elevated portion. This would create a partial tunnel without need for venting:
Doing an elevated park there would actually give it a unique feature, possibly increasing its appeal with higher views of the river.
Here's an example of an elevated park in New York
High Line Park Concept:
from inhabitat.com
Actual execution: