Drake

The Roman highways made it easier and safer to travel between cities but it still took awhile to walk from place to place. You'd have to think about it before starting that venture.

Churches in closer proximity to each other like Colosse, Laodicea, Hierapolis had more fellowship together and Paul requested the letters he wrote to each be read to the other.

In spite of their differences and circumstances they were viewed as a golden lampstand. They were identical in that way. And on the negative side they did not split up into many churches due to their differences so there were not several churches in Colosse or Laodicea.