Electric vehicles were the major theme at both of the season's bus exhibitions: Coach & Bus (pp22-23) and Busworld (pp10-11). Driven by government restrictions on diesel vehicles in urban areas to help improve air quality, many manufacturers are previewing new models of battery-powered vehicles. Outside of London, however, the regulatory picture is complicated. As each local authority can set its own rules, not every low-emission zone is created equal. Although some are indeed setting up zero-emission zones, even those are unlikely to spread as wide as London's. Many air quality zones do not penalise diesels, provided they comply with Euro VI standards.
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