BEIJING, Oct. 10 -- China's electric vehicles were a main means of transport on expressways during the National Day holiday, with the battery charge doubling year on year, data from the industry showed.

The average daily charge on expressways surged to 408,000 kWh during the week-long holiday, 3.6 times of that of off-holiday travel, according to a subsidiary of the State Grid Corporation of China.

Green transportation with electric vehicles is concentrated in the Beijing-Tianjin-Hebei region and the Yangtze River Delta region, with provinces of Hebei, Jiangsu, Zhejiang and Hubei ranking top four in battery charge.

An increasing number of Chinese took long journeys by electric vehicles thanks to improvements in the charging infrastructure. The number of charging posts across the country reached 1.08 million by the end of August 2019.

During the Spring Festival, the average daily charge exceeded 250,000 kwh. The figure went up to nearly 300,000 kwh during the May Day holiday.