For the record, 401 does have 6 lanes from Highway 402 to Cobourg (Exit 474), but I do agree (from driver’s perspective) that the stretch between Tilbury and 402 be widened to 6 lanes. Truck volume warrants it.
Well, alternatively, we can also get rid of the speed-limiter law, and allow trucks to pass at 120 km/h.

Western Canada and the Maritimes have no such law, anyway.