Cheng Jiulong, deputy director of Shanghai Public Security Bureau said the first barriers, located around a 4.5-square-kilometer area in the Expo zone, will subject random visitors to spot checks.
The second barriers, around a 3.28-square-kilometer area, will be more thorough. Every ticket holder will be checked.
Even with these security precautions, officials calculate they’ll be able to admit about 200,000 people per hour.
Starting Thursday, additional control measures will be applied to a 7-square-kilometer area around the Expo site. Only those with special credentials will be allowed to get inside this control zone. That includes people living in residential areas.
More than 15,000 residents and companies in the control zone have applied for the special passes.
Visitors staying in "Expo hotels" – those within a 15-minute car ride to the Expo site – will undergo strict security checks at the hotel. Guests at hotels that are farther from the Expo site will also be subject to security checks although these measures were not discussed in detail.
Security checks will also be in place at the 282 Metro stations in the city. Boats entering the city also need special passes.
Shanghai Daily reports that the police have worked out strategies to deal with emergencies such as fires, accidents and breakdowns of the power and water systems at the Expo site.