Big cities like Toronto and Ottawa have a lot of traffic.
All of those cars, taxis, trucks and buses create a lot of pollution. They also make getting around the city very difficult. There are a lot of traffic jams in big cities.
Some people ride bikes in the city. However, lots of bikes get stolen. Also, it can sometimes be difficult to find an empty spot in a bike rack when you want to store your bike downtown. Those things can discourage people from riding their bike around a big city.
But because biking is a much healthier way to travel than using a car, the City of Toronto and the City of Ottawa wanted to encourage people to ride a bike.
This summer, Toronto and Ottawa partnered with a company called Bixi to offer a new program which lets people rent a bike for short trips. People can ride to from one place to another downtown without having to own, use or lock up their own bicycle.