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Most passengers would be reluctant to touch the terribly cold handrail on the bus in winter.As is konwn,auto exhausts are usually discharged to the open air directly,which would be air pollution and a waste of energy as well.However,auto exhausts actually contains a suitable amount of heat .Handrails are often hollow and could be warmer with exhausts led into them via some connecting devices,which may relieve passengers' coldness when touching handrails.