And in order to promote the spread of the use of such conveyances, besides existing measures to reduce taxes on electric vehicle products, appropriate legislation would also be helpful. For example, a "California law" could compel some transporters to shift over to using non-polluting vehicles.
而為了推廣使用電動車，除了現行如減免電動車貨物稅的措施，適度的法律規範也是個好方法，例如「加州法案」的規定就可強制部分交通工具改用無汙染的電動車。