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Municipalities that wish to make their by-laws more credible and enforceable should consider reducing the number of exemptions. A number of vehicles – such as police, fire, ambulance, vehicles attending an emergency (tow trucks), mobile workshops, and others – are currently exempted because of the need to power warning lights, computers, refrigeration, air conditioning, heating, and other devices. However, auxiliary power units are now available to provide power for many of these functions, and use much less fuel than an idling vehicle engine. There are also new technologies – such as LED (light-emitting diode) lights – that require much less power, enabling them to be run from the battery rather than an idling engine.
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