In my current game (newest version), I have an issue, where two cities with Lighthouses don't create a traderoute. As you can see in this screenshot, my capital Istanbul is connected by road to Edirne, which has the Great Lighthouse, and south of that city is Bursa, which has a Lighthouse too. Why isn't Bursa connected to Istanbul via Edirne? Thanks Edit: Disregard above. I played 3 more turns, and suddenly, the traderoute got established. I have no idea about why there was a delay, since the path along the coast is clearly unbroken, but at least it works.