[1.01] Insta building the long road
I find that quite a potential exploit... That roads are instantly created between 2 cities. Case in point, a new settlement separated by no less than 27 tiles of wilderness and monsters lairs is now connected to my capital. That will prove quite handy to send through this highway my hero party for some good whack-a-ogre game...
I would suggest that the road is built one tile per turn from the new settlement and the other one toward each other.