The Montreal Metro rapid transit system was introduced in 1966 in preparation for the Canadian Centennial and Expo 67 World Fair in Montreal. Instead of traditional steel-wheeled trains, it is a rubber-tired metro, based on technology developed for the Paris Métro; Montreal's system was the first in the world to be entirely rubber-tired (as not all of Paris's lines use tires). The Metro system is Canada's busiest subway system in total daily passenger usage; in 2017, serving an average of 1,235,200 daily passengers on an average weekday; a figure which surpassed that of the Toronto subway and Vancouver SkyTrain. In 2016, 354 million riders (transfers not included) used the Metro, which since its opening had transported over 7 billion passengers as of 2010, roughly equivalent to the world's population.