I will agree with mountain biking being more dangerous. I've ridden on roads, day time and night time without incident for 35 years.
I rode mountain bikes for a period of 5 years maybe, on a regular basis. Flying down a trail at 35 mph doing and end over end, getting body slammed to the ground on red clay hard pack type surface, my helmet was cracked from back to front. A second time at about 25 mph in a turn, I crashed separating my shoulder being forced off the bike for nearly 2 months.
I agree with mountain biking being more dangerous.
Well, once I did take a turn at 25 when my rear tire blew out on the road. But I was able to keep upright and luckily the drivers were paying attention coming to a complete stop so that I could save myself. Just a taco rear wheel damage, but only a bruise on the back of my leg getting whacked by the pedal during a fishtail.
