"Oh Shit" moments...

I think the point is it's at least reasonably difficult to ride at a steady 25mph unless you're going down hill or have a pretty helpful tail wind. Were you riding fixed? If so what ratio are you on?

well okay ill describe the road, there's a T junction with traffic lights on each side and a tunnel under for the canal, so when its green you start on a hill, by the time i'm in the pedals and ready to go it goes downhill, then its a slight downhill then flat for about half a mile, i was on a 46:18 spinning pretty fast in the drops

so for about a quarter of a mile i can go pretty speedy