> Whatever the speed limit, you should never go 90 km/h in a blind turn if it is too fast to avoid a cyclist.

I suppose it depends on the country, but usually roads mandate minimum speeds (tipically half the max speed) in order to avoid issues like this. Anything lower than the minimum speed should be treated like a static obstacle, so maximum speed should always take into account unexpected hazards.

Given that cyclists cannot tipically maintain the minimum speed required in any country road, they cannot share the road with faster vehicles. It's either curbs or segregated roads. Anything else is plain craziness.