Hong Kong's Immigration Department expects 4.25 million people to pass through Hong Kong's land, sea and air control points during the seven-day Labor Day holiday period (or Golden Week), up 16 percent year on year.

Golden Week is the traditional peak travel period for Chinese mainland tourists and Hong Kong is a popular destination. A total of 460,000 Chinese mainland tourists are expected to visit Hong Kong.

According to the department, by 5:00 p.m. Sunday, a total of 156,00 people entered into Hong Kong via land, air, sea routes.

April 30 is a peak period for Hong Kong residents' traveling out. About 20,000 Hong Kong people left for the Chinese mainland via Lok Ma Chau check point at the small hours Sunday, set a record at this time of a day.

The department said, with the end of the Labor Day holidays in Hong Kong on May 2 and the arrival of more Chinese mainland tourists, May 2 will be a peak period for passengers to enter into Hong Kong.

A total of 200,000 people are expected to enter into Hong Kong via cross-border check points on May 2.

The Immigration Department has added more hands at various border check points. Only Lo Wu check point opens over 100 counters for receiving passengers.