I just found that Ottawa's Transitway is celebrating 25 years this year. Official celebrations were held in October.
The Ottawa Transitway is North America's largst busway, and also the busiest busway network in North America and one of the busiest in the world. Daily ridership on just the Transitway is over 240,000 riders.
The Ottawa Transitway is world reknown and planners from around the world have come to Ottawa, to see how Ottawa has become the city with the highest bus usage in North America for a city in the one million metro mark.

Photo thanks to OC TRANSPO.
Following are milestones of the Ottawa Transitway from OC TRANSPO
http://www.octranspo.com/mapscheds/Transitway/Transitway_25/Tway_Memories_Background.htm
1983-2008
--------------------------------------------------------------------------
1978: The Transitway system – the largest engineering project in the Ottawa-Carleton Region’s transportation history – is approved by Ottawa-Carleton Regional Council.
1983: First sections of the west Transitway open in December from just south of Baseline Road to Carling Avenue, and in the east across the Rideau River, with seven new stations at Baseline, Iris, Queensway, Lincoln Fields, LeBreton, Lees and Hurdman.
1984: Lincoln Fields is connected to LeBreton Station via the Ottawa River Parkway and the new west Transitway running parallel to Scott Street, featuring a large rock cut and new stations at Westboro and Tunney’s Pasture.
1985: Campus Station opens and the Transitway is extended north from Mann Avenue to Laurier Avenue.
1986: Laurier Station opens. The Transitway is extended from Laurier Station to Mackenzie King Bridge. The first Park & Ride lot opens at Place d’Orléans to ease congestion on the Queensway during construction.
1987: Train and St. Laurent Stations open along with a new section of Transitway from Hurdman Station to Michael Street, just east of St. Laurent. The 100 millionth rider is celebrated.
1989: Blair Station opens and the Transitway is extended from St. Laurent Station to just east of Blair.
1990: Cyrville Station opens.
1991: The southeast Transitway opens from Hurdman Station to Riverside Hospital, with new stations at Abbey (renamed Lycée Claudel in August 2002), Smyth and Riverside Hospital.
1992: Bus-only lanes introduced along the Transitway between Blair Station and Orléans Blvd.
1993: 500 millionth Transitway rider is celebrated.
1994: Place d’Orléans Station opens along with a permanent Park & Ride lot. Greenboro Park & Ride lot also opens.
1995: The new southeast Transitway opens September 3 from Billings Bridge to Hunt Club Road with new stations at Heron, Walkley and Greenboro, with improved service to the Airport. Eagleson East Park &Ride opens November 20.
1996: South Keys Transitway Station opens June 23. On November 3, the 31 km of Transitway, that was first approved in 1978, is completed at a cost of $420 million, with the opening of the Transitway from Billings Bridge to Riverside Hospital. The expansion of Billings Bridge Station opens, as well as Pleasant Park Station.
1998: The 750 millionth Transitway rider is celebrated.
1999: Dominion Station opens November 29.
2000: Mackenzie King Station opens June 28 with an underground passageway between the Rideau Centre and the eastbound platform, and with a new Sales and Information office in the Rideau Centre. Fallowfield Park & Ride opens October 29. Bayshore Station opens December 14.
2001: Bayview Transitway Station opens October 15 and Greenboro Station is expanded, coinciding with the launch of the Light Rail Pilot Project. Trim Park & Ride opens in November.
2002: The one billionth Transitway rider is celebrated September 10.
2003: Gold permit parking at Park & Ride lots introduced in March. Telesat Park & Ride opens September 1.
2003: Eagleson West Park & Ride opens November 3.
2004: Terry Fox Park & Ride lot opens September 5.
2005: Terry Fox Station opens February 22. A new 3.2 km extension of the Southwest Transitway, from the Nepean Sportsplex to Fallowfield Station, opens December 14.
2006: Jeanne d’Arc Park & Ride opens in June and Strandherd Station and Park & Ride opens in December.
2007: Teron Station and Riverview temporary Park & Ride lot open in September.
2008: The 1.5 billionth Transitway rider is celebrated along with 25 years of Transitway rapid transit service.
Future Transitway Plans
2009: Four Park & Ride lots to open at Millennium; Chapel Hill, Riverview and Leitrim, with approximately 200 spaces each in phase one. A new section of the West Transitway will open between Pinecrest Avenue and Holly Acres Road, with a new station at Pinecrest and an expanded station at Bayshore.
2010: Longfields Station will open along with a new section of the Southwest Transitway between Fallowfield and Strandherd Stations.
Other: New Transitway links from Strandherd Station via Marketplace to Barrhaven Town Centre, from Baseline Station to Norice, from Queensway Station to Pinecrest, from Holly Acres to Moodie, from Eagleson to west of Terry Fox and from Riverside to the Smyth Hospital Complex. Improvements planned at St. Laurent Station and Jeanne d’Arc.
Transitway Statistics
Number of Stations - 38
Park & Ride Spaces - 5,372
Bike & Ride locations - 31
Average weekday passenger volume - 240,000
Length of Transitway bus-only roadway - 34 km