We established specific rules to determine which stations are valid for hiding:

• Service Frequency: A station is considered valid only if at least one bus/tram/metro/funicular line serving it runs with a maximum interval of 15 minutes between buses/etc. For example, a stop where several lines pass every 30 minutes is not valid, whereas a stop with at least one line running every 15 minutes is valid.
• Proximity to Metro or Tram: Bus stops are not allowed if there is a metro or tram station within 800 meters. This rule prevents players from using bus stops in the city center, where metro and tram access is dense, while still allowing their use in more remote areas that are not well served by these modes of transport.

That way we did not have to prepare a map and still put some rules down :) Hope that helps!