This one makes sense- but the QEW needs some love if this isn't built. Hamilton to St. Catharines can really use an extra lane right now. That merge just past the Red Hill Niagara-bound is atrocious. You have 4 lanes from the QEW and 2 from the Red Hill merging into 3. Getting a 4th lane built, even if it is HOV will really help the bottleneck out.
Eventually when the Garden City Skyway is twinned you could see 8 lanes on the QEW all the way to the 405 interchange or perhaps even the 420. The widening in St. Catharines would be tough tho.. that's a narrow corridor to add another lane in, especially if it is HOV with a proper buffer zone.
Bonus bucks if you can somehow extend the HOV through the Freeman Interchange in Burlington and cannibalize one of the lanes on the Burlington Skyway for HOV. That would allow a HOV lane to run all the way to the 403 split in Oakville!
MTO has plans to add HOV’s, but I don’t think they are particularly needed right now past Grimsby, and definitely not past the 406. The QEW through St Catharines was just widened, what, 10-15 years ago and operates just fine.
The Garden City Skyway is planned to be twinned and widened to 8 lanes in the next few years, mostly as a result of rehabilitation needs of the existing bridge. It’s a waste of money if you ask me as the extra capacity really isn’t needed, they probably could have gotten away with simply reducing the bridge to 4 lanes for a few years to do a staged rehabilitation.
MTO does plan to eventually widen the Burlington Skyway again as well, from what I recall it involved a widening of the eastbound structure from the 1980’s. nothing immediate though as it is obviously a very expensive project. In the interim the HOVs through Oakville and Burlington will be extended to the immediate base of the bridge at North Shore Boulevard.