Historical Highways Society of Ontario
- Organization for the preservation of the Provincial Highway system and an information source for its former portions.
- http://www.hhso.ca/

OntHighways.com
- Includes text descriptions of former and current routes, with pictures.
- http://www.onthighways.com/

Friends of Red Hill Valley - Expressway
- Opponents of this facility in Hamilton. Page includes facts and references.
- http://www.hwcn.org/link/forhv/expressway/expresswaytitlepage.htm

407 ETR
- Information about the world's first all-electronic open access toll highway, which extends 108 kilometres east-west, just north of Toronto. Explains the road's special features, tolls, and transponder use.
- http://www.407etr.com/

The Road Scholar
- Historical information and anecdotes.
- http://roadscholar.on.ca/

The History of Ontario's King's Highways
- Offers historical and current information, including images of old signs as well as old photographs.
- http://www.thekingshighway.ca/

Road Info
- Covers Toronto.
- http://599-9090.com/

Ontario Ministry of Transportation
- Profiles agency responsible for transportation and roads. Includes information about operations, publications, legislation, and links to related sites.
- http://www.mto.gov.on.ca/