^^Can't open the link for some reason.
Here's an outline of the MTO's Southern Highways Program, which details highway construction and maintenance projects over the period of 2008-2012.
http://www.mto.gov.on.ca/english/pubs/highway-construction/southern-highway-2008/SOHP2008EN.pdf
(from:
http://www.mto.gov.on.ca/english/pubs/highway-construction/)
I once found a long-term highway expansion strategy published by the MTO, but I can't seem to dig that up again.