This guy was tailgating me on my motorbike so I kept speeding up to widen the distance but he wasn't getting the message. He finally undertook me at speed, then moved into my lane extremely quickly whilst slamming on the brakes leaving no space between the car in front and almost knocked me off my bike. Whilst braking he momentarily went out of control swerving all over the road dangerously at around 50mph.
Drove in the middle of the road in a carriageway. Who is that irresponsible?