Environmental Problems The typical diesel engine on the bus causes noticeable levels of air pollution, noise and vibration. With hybrid vehicles and the new forms of trolleybus, BRT designers hope to increase ride quality and decrease pollution. As the energy use for acceleration is proportional to the vehicle mass, electric traction allows lighter vehicles, faster acceleration and energy that can be fed back into batteries or the grid through regenerative brakes. Regenerative braking is standard on many modern rail systems.
A BRT system can use trolley-buses to lower gaseous and noise emissions. The price penalty of installing overhead lines could be offset by the system's environmental benefits potential for savings from centrally generated electricity, especially in cities where electricity is less expensive than other power sources. In addition, most trolleybus applications can be converted to light rail with the only extra expense being the laying and maintenance of tram tracks in the street.
A BRT system can use trolley-buses to lower gaseous and noise emissions. The price penalty of installing overhead lines could be offset by the system's environmental benefits potential for savings from centrally generated electricity, especially in cities where electricity is less expensive than other power sources. In addition, most trolleybus applications can be converted to light rail with the only extra expense being the laying and maintenance of tram tracks in the street.
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