Bus Rapid Transit (BRT)

While reading about the Ottawa bus network on the Transit Politic, this quote struck me:

"Unlike most “BRT” lines in North America, ’s are mostly grade-separated, producing actually high-speed buses".

One of the questions I get asked the most is when I talk about transit is "What is BRT? How does it differ from a bus?" For me, the distinction is as follows:

• Class III - 'Basic': Longer hours, 15 minute service, special branding, substantial stations, CNG/Electric bus, signal pre-emption. 
• Class II - 'Arterial': Dedicated lanes, off-board fare collection, 3 door boarding.
• Class I - 'Busway': Limited access, often grade separated, with no traffic lights. 

To my knowledge, the only cities in the world with Class I BRT are Brisbane, Ottawa, and arguably Curitiba.