21. The trial is studying the feasibility of gas-powered vehicles and giving drivers operational experience. 22. Traffic parks in Asia and Europe are focused on traffic safety through pedal-powered vehicles . 23. Additionally, gasoline prices remained high, limiting demand for V8-powered vehicles . 24. DaimlerChrysler and Ford plan to put fuel-cell powered vehicles on the market by 2004. 25. Ford produced a selection of natural-gas powered vehicles but recently gave those up too. 26. Aurora was started in 1980 by building high-fuel-efficiency petrol-powered vehicles . 27. Martignoni said the work had fed his appetite for promoting en ergy-efficient human-powered vehicles . 28. The rental cost is comparable to that of a similar gasoline-powered vehicle , he said. 29. Cannon said the fuel would play a much different role in hydrogen powered vehicles . 30. In 2002 Rinaldi organized the first Bakersfield-to-Fresno handsaw-powered vehicle rally.
