Weird situtation but I was in lane 4 and a car was stopped with emergency lights on in lane 1. a lorry almost hit the stopped car (texting?) but change lane last minute which triggered a cascade of lane changes; jaguar in lane 2 jumped to lane 3 and a tiny corsa with a guy and his young son from lane 3 in lane 4 right in front of me. Thankfully my reaction time was good and the car managed to stop from 70mph in short distance. Otherwise the guy infront of me would of launched into orbit with his young child inside...