I was making the point that Mr Hammond was driving a type of vehicle that is probably as far removed from everyday cars as you can get. This was basically a jet engine on wheels. There is no gearbox, no clutch, no brakes to speak off, virtually no steering and the throttle is either on or off. It has been described as basically a jet aeroplane with no wings which is why I made the point that jet pilots are more experienced in this type of machine. Mr Hammond has never driven any vehicle at 300 mph because they don't currently exist, and I am not aware that he has a jet pilot's licence.
Now the reasons why he did this action are only ones he can answer. Driving the vehicle is one thing, trying to break a speed record is a totally different ball game. A high speed train has wheels and a great big engine but would that qualify him to drive it?