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The development of public transport is an effective way to cope with urban expansion and energy conservation. The advantage of prioritizing development of public transport is not only well received in developing countries where cities are rapidly developing, but also actively promoted by developed countries. 
Recently, the U.S. government has given a generous financial incentive to operators who purchase hybrid buses (unlimited), amounting to approximately US$100 million. Nineteen operators across the United States have won this bonus. Among them, the Chicago Transportation Authority received the maximum amount of $30 million in prize money. This time, the bonus comes from part of the government's fund for facility improvement and future plan support. The fund is worth $928.5 million.
Peter Rogoff, the administrator of the U.S. free trade agreement, said: "These bonuses are used to ensure the reliability and satisfaction of bus services in the U.S. community, while also bringing jobs to thousands of Americans." He also said: "With the passage of the U.S. Employment Act, Congress will also speed up the process of related work so that the U.S. people will have more opportunities to travel by bus and travel less."
It is also known that there are currently three types of hybrid buses. One is the “parallel connection method†in which the engine is the main power and the electric motor is used as the auxiliary power of the secondary and series hybrid electric vehicles. The other is that when the speed is low, the electric motor is used to drive the vehicle. When the speed is increased, the engine and the electric motor cooperate to drive the series and parallel mode. Another type of electric vehicle is a "tandem mode" in which only an electric motor is used to drive the vehicle. The engine serves as a power source. The vehicle is driven by an electric motor only. The drive system is only an electric motor. However, because the fuel engine is also required to be installed, it is also a hybrid vehicle. The most common type of bus.