[willyt]

Lots of roads like that in Britian as well and the speed limit is 60mph/100kph. Not uncommon for two cars on a single track road to adjust speed to pass each other at a passing place without slowing down much, so at a closing speed of over 100mph. Perfectly safe for human drivers who know the roads.

[smeyer]

This sounds like the sort of "perfectly safe for human drivers who know the roads" that actually results in a fair number of road deaths.

[willyt]

If you look at the accident maps, there are almost none on single track roads and lots on twin track roads. My hypothesis is that driving on a single track road feels much more risky so people pay more attention and slow down more on blind corners. Also, it’s not possible to overtake and a lot of accidents are related to overtaking.