I was driving back from work on a dual carriage way and I saw a car indicating in the slip road. His indicater was running fast so I assume it was broken. I moved over to let him join (And my exit was in the right lane anyway) and as i drove past the indicater went off and I saw a flash from the back of the car. It wasn't a police car and I was well under the speed limit. Car appeared to be a Mazda MX5 (One of the older ones). Heres a video from my dashcam...
https://www.youtube.com/watch?v=75_OHuAc6gM
https://www.youtube.com/watch?v=75_OHuAc6gM