Commuter Challenge is a national, week long event in Canada and is held annually during the Canadian Environment Week. Formatted as a friendly competition between workplaces and Canadian municipalities, the national and host city coordinators announce winners based on the highest percent participation. The event has a strong workplace focus where employers promote the event in-house to support their employees in leaving their cars at home in favour of more sustainable commuter modes including walking, jogging, cycling, in-line skating, public transit, carpooling and teleworking.