The Transitway is a bus rapid transit (BRT) network operated by OC Transpo in Ottawa, Ontario, Canada.

OC Transpo operates a network of rapid routes which use the Transitway to connect communities with the O-Train light rail system.

Ottawa's Transitway has been seen as a prime example of bus rapid transit internationally, and has influenced the design and creation of other systems worldwide.

[2] The Ottawa Transitway has also been used as a model for how to design bus rapid transit, such as is the case for Brisbane, Australia and Mississauga, among others.

[3][4] Most of the Ottawa Transitway is grade separated from other modes of traffic, using trenches and elevated structures to bypass intersections.

[6] The Transitway was the first bus rapid transit system of its kind in North America, and has had a significant impact on Ottawa, as well as cities across the world.

Priority measures were later added to Woodroffe Avenue and Regional Road 174, extending service into the suburbs of Barrhaven and Orleans.

Instead, all rapid routes use the Transitway to connect communities to the Confederation Line at one of three stations: Tunney's Pasture, Hurdman, or Blair.

Buses were detoured along Scott Street parallel to the former central Transitway, with a temporary extension and bridge connecting to Dominion Station.

[16] The following are OC Transpo's rapid routes, which travel along the Transitway with frequent service connecting communities to the O-Train.

The east Transitway currently consists of a series of intermittent bus-only lanes along Regional Road 174 between Blair and Place d'Orléans.

In June 2022, the remaining segment of the central transitway west of Tunney's Pasture was closed for O-Train Stage 2 construction, with buses now running along dedicated bus lanes on Scott Street.

Traffic congestion here, where the buses mingle with private vehicles, often caused service delays and was seen by some as the main weakness in the Transitway system.

In 2006, it was proposed to extend the O-Train downtown as a tramway over the same streets while keeping existing bus and car traffic.

This former section of Transitway was a two lane bus-only corridor between Cahill and Lorry Greenburg Drives in the Greenboro neighbourhood in south Ottawa.

As time went on, the planned neighbourhood's density was heavily reduced due to heavy backlash from the local community using the slogan “buses out of backyards”.

On September 2, 1995, OC Transpo ran its final bus on the corridor, and it was then gated up and left abandoned for the next 7 years.

A separate median busway east of Marketplace connects Beatrice and Nepean Woods before traveling along reserved lanes to Riverview.