(Google Street View)
This sign straddles a motorway west of Seoul. Most notable is the panel at the left. While it used to be possible for some people (workers, tourists in authorised groups) to travel as far as Gaeseong, travel to Pyongyang hasn’t been possible for as long as this motorway has been here. I suspect that everyone driving here knows that. I have a memory that a sign gives distances. Either I’m misremembering or there’s another sign. Seoul and Pyongyang are 195 km apart, and it is theoretically possible to cover that in approximately 2 hours. Practically …
The text at the bottom of the left-hand panel says South-North exit/entry ticket office.
(I suspect that the road signs on the other side of the border don’t include Paju and Seoul.)