Surely building this is better than doing nothing.
If you build it, they will come. Where are they coming from? The overloaded 401.
Using this bypass coming from London / KW, I could avoid Mississauga & Toronto entirely including the snarls at 403/410, 427 and 400 interchanges to get to Barrie. Those highways will flow slightly better because of people like me now using the new route.
-Yes I could use the 407 now but without a transponder that's one hell of a rip off for a short trip from 401 to 400. (This new route could be tolled, but needs to be a modest price).
This isn't a really urban commuter route... It won't promote sprawl nearly as much, especially with modern urban planning & policies like the Greenbelt.
This strikes me as awfully naive. You don't think people said this exact thing about the 401 a few generations ago? That this wasn't the entirety of the logic of building the 407? You don't have to go digging through old microfiche in the library to find that both highways were proposed as by-passes of the city rather than "urban commuter routes."
I'll say this much, there are two competing things that are true:
1) Some "urbanists" object to any new lane of road or highway being built anywhere and cite it as proof of a lack of commitment to a more sustainable future etc. This is ridiculous because no matter how many people we get into trains and transit and whatever else we do, we're still a growing region and need alternative routes etc. We have a lot of drivers and will have more. Not every highway extension is a nail in the coffin of human existence. Sometimes we're just making it easier for people to get from A to B.
2) Induced demand is real. Where a road does not now exist, there will be more cars than you expect once you build it. It's been proven time and time and time again, the best and easiest example perhaps being how every time Robert Moses built a new bridge in NYC, it was to alleviate traffic on another bridge. And every time he did it, both bridges were packed within months of the new one opening. So that shoots down this idea that overcrowding on the 401 will disappear or even be noticeably alleviated. It won't.
I'll also add that we don't know what's happening with autonomous cars and while it's easy to be skeptical, there's also enough going on to make one think twice about the need for another 400-series highway. There seems to be this weird irony-free argument that the highway makes MORE sense if there is no or less or "more sustainable" development around it, but I don't see it. Once the road is there, the demand for development will be there. It's a Catch 22 fundamental to human civilization.
If you wanna build it, you can build it. Arguably this region would indeed benefit from a truck by-pass of the GTA and I'm not saying otherwise.
But don't do it thinking you're really taking cars off the 401 and you'll have 2 easy-going highways instead of 1 super-crowded one and don't do it thinking it won't open the door to potential development in areas that in the Greenbelt or otherwise undeveloped today. (And definitely don't think there are no private landowning interests along the corridor who want to see it built for precisely these reasons).