Quote Originally Posted by Jantar View Post
Ok, I've just punched this data into a calculator. An experienced rider on good tyres on a dry surface, and with a perfect braking technique would stop in 43 meters from 100 kmh at 0.9G.

The same rider travelling at 120 kmh would still be doing 66.3 kmh at impact.

However it sounds like he wasn't an experienced rider, so lets work on only 0.5 G.

From 100 kmh he would still be doing 66.3 kmh at impact, the same as an experienced rider at 120 kmh.
To stop in 43 m the inexperienced rider would have to be going no more than 74 kmh.

So my guess is that the police estimate of 100+ would be fairly accurateclose to the mark.
shows how much variation there can be calculating speeds!