He was driving dangerously. He cut in front of me then didn't give enough chance for another car to turn while in the middle of the junction. He then kept slamming on his brakes and giving me the middle finger. I followed him still he stop to try to understand his behaviour. I got loads of abuse and tried to make out I was tailgating on a 50mph road although he said it's 60mph. All the way signs show 50mph. I just think this man going cause a serious accident.