Officer Liu Yulin, who was monitoring traffic on a CCTV system, said: "I saw on the screen that a man was driving two bumper cars. He sat in between the cars, and each foot stepped onto one gas pedal. I immediately radioed the officer at that road section to go and check." Officer Xiao Hu then stopped the yellow cars and their owner, a Mr Zhang, who said he was moving them to a local park. He claimed he was driving them there because it was the most economic way of transporting them.