Riding home. In the Sydney Harbour Tunnel. SUV in left lane, with one of those tv screens in the middle of the windscreen. It's on. Kids in the back. I pulled in alongside and cranked the monster up to 7k rpm for a bit before pulling away. Then I thought I should have got the license plate and reported them. But then was when I was long gone. But then I wasn't sure if it was illegal or not. Is it?