Some more detail about the 401 expansion between Mississauga and Milton
http://www.infrastructureontario.ca/Hwy-401-Expansion/
Features
-12 lane core-collector system from the Credit River to Winston Churchill Boulevard;
-10 lanes from Winston Churchill Boulevard to Highway 407 ETR/ Highway 401 interchange;
-12 lane core-collector system from Highway 407 ETR/ Highway 401 interchange to east of the James Snow Parkway;
-10 lanes from the James Snow Parkway to west of Regional Road 25;
-Median HOV lanes; and
-Support facilities and features - drainage, lighting, signage, ATMS, carpool lots etc.
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I'd also assume there would be projects in the works to fill in the widening projects in Kitchener (Hwy 8), Cambridge (Hwy 24), Guelph (Hwy 6) and Milton too. Maybe 8+2 HOV minimum from Hwy 8 to Hwy 407 ETR?