"The most opportunistic method would be to use the combustion engine outside the city and switch over to the electric motor inside city limits," assesses Ho Chien-huei, an engineer at P.P.P .. Overall, this type of design could still reduce environmental pollution.
「投機一點的方法，是在郊區用汽油引擎，市區內改用電動馬達」，新旅程公司工程師何建輝評估，總的看來，這種設計還是可以減低環境的汙染。