Having a network of roads/communications that extends in all directions (well-connected); figuratively, something that reaches widely.
この港町は四通八達で物流の中心地になっている。
This port town is well-connected in all directions and has become a logistics hub.
首都は四通八達の道路網が整備されている。
The capital has a well-developed road network extending in all directions.
四通八達の交通網のおかげで配送が迅速に行える。
Thanks to the well-connected transportation network, deliveries can be made quickly.