the mass downloading of Ontario's provincial highways onto regional authorities in 1997 and 1998, the former Regional Municipality of Ottawa-Carleton was given responsibility over former Highways 16, 31, 44, and the section of 17 east of Highway 417. These former highways became known as Regional Roads (subsequently Ottawa Roads) 73, 31, 49, and 174, respectively. List Former Numbered Roads General Patterns Even-numbered roads (East-West Direction) Odd-numbered roads (North-South Direction) See also List of roads in Ottawa List of Ontario county numbered roads GeoOttawa (City of Ottawa's mapping software; only shows road numbers in rural areas) Official road map of Ontario (shows most major numbered roads in Ontario) Map of Ottawa (2007) (Displays most numbered roads as of 2007) City of Ottawa Official Plan Maps (Display most numbered roads) Ottawa-Carleton Regional Roads Report References Roads in Ottawa Ontario county roads Roads, Numbered Ottawa