Exit numbers
In Japan’s major cities, subway stations are often massive underground shopping areas connecting numerous rail platforms operated by different entities. Stations can have dozens of exits making it hard to know which way to proceed when you get off a train. Taking the wrong exit can put you on the wrong side of above-ground train tracks that are very hard to cross, as we found at Shin-Osaka station!
There are three conventions used consistently for exits everywhere we went: the use of yellow, exit names, and yellow circles with exit numbers.
Typically the only thing you want to do when you arrive at a station is to leave (although in Japan one might also add getting lunch), and the consistent yellow signs for exits made it easy to spot this crucial information among all of the other signs present in stations:
Numbering (“1”, “A1”) and labeling (“East”) exits helps when giving directions (e.g. “Meet me outside exit 1.”), and once you’ve identified an exit that works for you the fact that the exit has a name and signs leading you to it helps to find it again when you’re making the same trip later. Google Maps directions even tells you which exit to look for because it knows which is closest to your destination.
Here’s an overhead sign that uses the yellow circle convention of indicating where the exits are by their number.