Even when the Canadian city's broad avenues are filled with traffic, Calgary Transit's buses run nearly as fast as they do when the roads are empty.

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Jodie Marcyniuk, a transit priority engineer at Calgary Transit, notes that each of its transmitter-equipped buses saves 2, 000 gallons of fuel and nearly 50, 000 pounds of carbon dioxide emissions per year compared with buses on regular routes. (The calculations do not net out the extra gallons idled away by drivers on the cross streets.) "It works out beautifully, " says Marcyniuk.

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