Today, May 1, is the first day of China's five-day Labor Day or May Day holiday. /CFP

High-speed railway stations across the country have been crowded with passengers. /CFP

China's Ministry of Transport estimates about 265 million domestic trips to be made over the five-day Labor Day holiday. /CFP

Departure passenger flows on the first day of the holiday are expected to peak at about 57.9 million trips, up 115 percent and 6 percent from 2020 and 2019, respectively. /CFP

Between April 29 and May 6, railway passenger trips are expected to reach 106 million, up 0.8 percent compared with the same period in 2019, said China State Railway Group Co. Ltd. It estimates trips will peak on May 1 at 17 million. /CFP