TBH, where I live, those 80km/h roads aren't as bad as you would think. Cars slow down before bends because they anticipate that a bicycle, hiker, tractor or whatever slow moving vehicle and usually pass them with decent space.
But that is only true for less frequented roads, if there is heavy oncoming traffic and save overtaking is not possible, people will still try to squeeze through and there separated bike lanes are really important.
TBH, where I live, those 80km/h roads aren't as bad as you would think. Cars slow down before bends because they anticipate that a bicycle, hiker, tractor or whatever slow moving vehicle and usually pass them with decent space.
But that is only true for less frequented roads, if there is heavy oncoming traffic and save overtaking is not possible, people will still try to squeeze through and there separated bike lanes are really important.