one empire, with no computers, slide rules, calculators, university trained engineers, Army Corps of Engineers, road graders, dozers, excavators, dynamite, rebar, cement, etc... made more roads than any other ever had, or ever will... on three continents, over about 500 years, and many have lasted for millemium

the Roman road system, covering 186,411 miles

https://gizmodo.com/the-biggest-map-of-roman-roads-ever-made-still-isnt-big-enough-2000811770

https://www.britannica.com/technology/Roman-road-system

https://www.history.com/articles/ancient-roman-roads-network