SHANGHAI - Since Expo 2010 Shanghai overlaps with this year's national college entrance examination, or gaokao, the police have sent reinforcements to divert traffic and to provide extra security around campuses.

A total of 66,000 students were due to take the city's three-day exam, which began on Monday. To accommodate them, 3,200 policemen and traffic coordinators were dispatched to keep traffic flowing around the 101 exam sites in Shanghai, according to local authorities.

For students who live near the Expo Garden, the cars or taxis they take to the exam are entitled to receive a green pass for the traffic controlled area, if they show their admission cards for the exam. The police were also prepared to provide rides to students in emergency situations.