Japan and Australia have had these for ages. In the
picture below you can see that some of the older stations actually use old-fashioned
moving physical digits and letters, such as were in digital alarm clock in
the 60's and 70's before LEDs. In Australia/New Zealand, brightly burning
LEDs already allow you to walk to a bus stop and recognize from a distance
that there is time to step into a store for a few minutes as the bus not
quite there. This works with a transponder on the bus giving off a unique
signal based on its current location. (Location self-determination is already
available in most buses and does not require GPS, typically the driver aligns
an announcement tape with the current station, and is able to briefly delay
the tape if he lags behind).
|