Just goes to prove that if you put a camera on someone they lose all ability to be normal and sensible, should we open a book on how long till you come on here and cry about being hit?
As for the speed..
45 kilometre/hour = 27.961 703 651 mile/hour
I also think I saw...
69 kilometre/hour = 42.874 612 264 mile/hour
Sorry but doing this speeds down hill is childs play, heck I can hit 38mph on my fixed wheel (72" gear) without much effort, and well over 40 on my road bike and Norfolk is relatively flat, hell I even hit 37mph in a sprint for a sign and that was on the flat and we all stayed on the right side of the road.
Nothing big about being an idiot, other than you think its cleaver, we'll just sit back and laugh at you not with you