Motorists are being advised to give Kai Tak a swerve on Friday evening as tens of thousands of people head there for the biggest test event yet at the nearly completed sports park in the area.

About 63,000 people are expected to pack the main stadium, the arena and the youth sports ground to capacity.

The crowd, most of them civil servants, will be treated to a concert by bands from various disciplined services.

At a press briefing on Wednesday, deputy police commissioner Chow Yat-ming said the test will be conducted in three stages between 6pm and 10pm.

"The first stage is when participants enter the venues from about 6pm, and the second stage is a test of a simulated emergency evacuation, while the third will be when participants naturally exit the venues," he said.

"The test will involve civil servants, government employees, as well as members from different social communities, and we'll test our arrangements on the natural entry and exit of participants, and that for buses and taxis, to make sure that the event will be conducted in a safe manner."

Chow said that being as 10 drills have been held at the park since last October, the main purpose this time will be evaluating facilities surrounding the site.

Assistant transport commissioner Chow Bing-kay urged people taking part in the drill not to drive to the venue, saying roads in the area will already be busy with rush hour traffic.

Other motorists would also do well to avoid Kai Tak if possible, Chow said, adding that extra MTR services will be running, especially between Kai Tak and Sung Wong Toi.