road pavers

idk if someone already posted this or not but I think there some of the cities on any given map are ridiculously hard to get to/ out of the way, based on the roads that are built to a city in a providence like this (see image). If I wanted to get from Gafsa to El Oued id have to go all the way to Hassi or Touggourt to get there. But what if we have a non-combative troop to pave a road to that location? this road paver could build roads in a straight line (within a radius that can be extended with research) and to balance it, the troop could be one time use, expensive to make and roads would take days/weeks to make (based on distance). if attacked from a distance (ie. planes or artillery) the road would become incomplete.

Idk this is just a thought and feel free to shoot it down if you feel like this is not a reasonable solution to the problem, I'd just like to throw this idea out there for conservation purposes.