Singapore authorities have caught a rider seen in a viral video striking a “Superman” pose while riding a personal mobility device (PMD) in the latest of a series of crackdowns.In the video, taken in the early hours of May 23 outside Keppel MRT station, the rider is caught on camera going faster than cars on his PMD. At one point, he even lies on his tummy with his legs extended as if he is flying. Based on the 170 metres he covered in about 8 seconds, his speed is calculated to be almost 80...