BEIJING, Sept. 14 -- China is expected to see an average of 1.8 million daily cross-border trips around this year's Mid-Autumn Festival holiday, a 21.9 percent increase from the same period last year, official data shows.

According to the National Immigration Administration, cross-border travel will peak on Saturday and next Tuesday. Passenger flow at major international airports as well as land crossings to Hong Kong and Macao will see a significant increase.

The administration has requested border-check agencies nationwide to step up the monitoring of passenger flows and port operation, and ensure safe, efficient and smooth customs clearance for passengers.

The Mid-Autumn Festival is one of China's most important traditional holidays. Taking place annually on the 15th day of the eighth month in the Chinese lunar calendar, it will be observed on Sept. 17 this year.