But if I take a bus, the bus only emits about a quarter of a pound per mile that the bus drives per person in the bus.

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He said that since November 2011 Metro services have increased by about 1, 500 passengers per day and use of Belfast's bus based park and ride services had risen by 15%.

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Things like the number of computer instructions per clock cycle, the bandwidth of the RAM bus, and the overall efficiency of the architecture are at least as important as the raw clock speed at which a processor runs.

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Enter the IEEE 1394 architecture and its close kin FireWire, which takes the high-speed digital bus interface up to the wicked fast transfer rate of 400MB per second.

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According to the American School Bus Council, the average fuel consumption for diesel-powered buses is seven miles per gallon.

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