Highways exceeding 100k AADT in Ontario in 2010 (by CMA):
Toronto:
QEW: 197,000 (Third Line to Dorval)
400: 213,500 (Finch to Steeles)
401: 403,300 (400 to Weston)
403: 214,200 (401 to Eglinton)
404: 302,800 (401 to Sheppard)
409: 110,500 (401 to Kipling)
410: 180,600 (Hwy 401 to Courtney Park)
427: 365,000 (Burhamthorpe to Rathburn)
QEW (Hamilton): 208,300 (Guelph Line to Brant)
QEW (St. Catherines): 101,200 (Lake to Ontario)
8 (Kitchener): 101,400 (Fairway to Conestoga Pkwy)
85 (Kitchener): 111,200 (Victoria to Wellington)
400 (Barrie): 112,300 (Dunlop to Bayfield)
401 (Kitchener): 125,600 (Hespeler to 8)
403 (Hamilton): 128,300 (QEW to Waterdown)
417 (Ottawa): 174,800 (Parkdale to Rochester)
Source