In 2003, a similar law was passed to clean up diesel-powered vehicles on construction sites.

For conventional gasoline and diesel-powered vehicles, fuel economy numbers may be the toughest standards to meet in the coming years.

The D2 class caters for diesel-powered vehicles exceeding the limit of 2,000 cc in D1.

The first diesel-powered vehicle on the Donautalbahn was the VT 60.

On the Continent, governments have actively encouraged the use of diesel-powered vehicles as a way of stretching resources.

What is more, gasoline- and diesel-powered vehicles are currently far cheaper to buy than those modified to run on other fuels.

Fuel consumption data indicates performance is 27% better than an equivalent diesel-powered vehicle.

California environmental regulators voted earlier this month to eliminate the more lenient pollution standards that have long prevailed for diesel-powered vehicles.

It will be tested by a fleet of 150 trucks, school buses and other diesel-powered vehicles.

Environmental groups in this country oppose the wider use of diesel-powered vehicles.