The world's highest "Ferris wheel" starts its trial operation in a drizzly Guangzhou, capital of South China's Guangdong province, Sept 1, 2011. The world's highest "Ferris wheel" starts its trial operation in a drizzly Guangzhou, capital of South China's Guangdong province, Sept 1, 2011. The giant ride, built on the roof of the city's new 450-meter TV tower, consists of 16 cars, each with a six-person capacity. Each rotation along the tilted roof of the tower takes 20 minutes to complete. The ride has been dubbed a "Ferris wheel" because from ground level it looks like one. To ensure safety, a weather alert system was installed in the tower to monitor weather conditions, and it will send an alarm 20-50 minutes ahead of any disastrous weather, leaving enough time for visitors to evacuate. Children shorter than 1.4 meters and people older than 70 are not allowed on the ride alone. The ticket price for the ride is 130 yuan ($20.36). [Photo/CFP]

The world's highest "Ferris wheel" starts its trial operation in a drizzly Guangzhou, capital of South China's Guangdong province, Sept 1, 2011. [Photo/CFP]