> Modern Australian roads in the bush have inexplicable kinks, 100km of direct, then a bend. I think Fred on the tractor got bored.

Or long stretches of monotonous driving can cause people to'self hypnotize' and 'zone out', so a bit of 'variety' very so often may help with alertness.

See perhaps:

> The Autovía del Olivar which unites Úbeda with Estepa in Andalucia in southern Spain. A geometric design saved on construction costs and improved visibility with the intention to reduce the likelihood of traffic incidents

* https://en.wikipedia.org/wiki/Geometric_design_of_roads

Also maybe:

* https://ssti.us/2019/10/28/more-sharp-curves-make-roads-safe...

I want to write a comment about living next to the Fosse Way but instead I have to point out that website is only missing the <blink> tag.

It only covers Roman Empire Roads.

See Also: https://en.wikipedia.org/wiki/Shudao https://www.newcivilengineer.com/archive/chinas-ancient-road...

  Roman roads relied on thickness and rigidity, and sometimes needed excavations up to 2m deep. This meant they were long lasting but allowed nothing for temperature induced expansion or contraction. They were consequently prone to surface fissuring and uneven drainage.

  The Chinese roads, on the other hand, were more akin to modern highways, being thinner and more elastic. They were built with a rubble sub-base onto which a layer of finely tamped gravel was added to produce a 'water- bound macadam'.