Father fined for letting son, 5, ride on lap A father was charged after he was caught riding a motorcycle with his five-year-old son sitting on the fuel tank. He was caught by the new WA Police unmarked motorcycles. A FATHER has been fined for riding his motorcycle with his five-year-old son sitting on his lap and leaning on the fuel tank in Perth yesterday. The man was caught riding with his son, both in shorts and T-shirts and the son barefoot, on Scarborough Beach Road about lunchtime on December 22 in Innaloo. He is one of the first people to be charged by officers riding on the new unmarked police motorcycles fitted with helmet cameras to record drivers offending on WA roads. The man was charged with carrying a passenger on his lap. He was fined $100 and one demerit point. A police spokesman said police inquiries into further charges, such as riding with a passenger under the age of eight, were continuing.