Buses are an important component of a sustainable transportation system.
Three quarters of all airborne pollutants in the Greater Vancouver Region are caused by motor vehicles. A bus passenger creates only about one-fifteenth of the air pollution created by a car driver. Transit, in general, contributes to the environment by reducing air pollution, noise, congestion, accidents and the land consumed by roads and parking facilities. It also contributes to the growth and vitality of the urban core and other activity centers. It is useful to consider the types of social costs which might result in the absence of transit.