On Mon, 22 Dec 2014 15:16:39 +0000, "
wrote:

I wonder if there has been either in London, or anywhere else in Europe,
which requires activation of a lamp or any sort of signal beacon to let
a bus or even train know that there are passengers wishing to board at a
particular stop.

The stop named Kopstadkrysset on the Nor-Way Bus Express line 190
(Kristiansand - Oslo) has such an arrangement. Passengers press a
button at the stop and a signal is lit on the main road.

Reference (Norwegian only):
http://www.nor-way.no/artikler-for-k...3697-5075.html

--
jhk