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Caocao said the number of testing vehicles will grow to around 10 in the second half of the year, and to several hundred by 2022. The fleet is expected to offer service in downtown Hangzhou during the 2022 Asian Games, which will be held in the city.

Charging networks for such vehicles have also been growing rapidly, with a total of 431,800 charging poles built by the end of November, according to the China Electric Vehicle Charging Infrastructure Promotion Alliance.

Cars made in Hubei province are ready to be delivered to the rest of the country via a Yangtze River port. [Photo by Liu Junfeng/For China Daily]

Chang Jiwen, deputy director of the Institute for Resources and Environment at the Development Research Center of the State Council, said these measures are key for effective implementation of systems included in the document.

Caterpillar said on its website in June that the BRI is "remaking global trade and nurturing geopolitical ties".