Are the signals that are normally found on the upper left side of the tunnel
entrances at Victoria line stations actually starter signals or are they
platform repeaters? I notice that the stations do not appear to have
track-level starters, execpt for areas where there are points, such as at
Victoria.

I realise that the various equipments differ, but I it seems that signal
aspects on the Victoria line are the same as those on the Central line.
These include a danger aspect, an aspect allowing trains on code to proceed
and a clear aspect for all trains.

In any event, I notice that many drivers on the Central and Victoria lines
prefer to wait until they get a full clear before closing up and proceeding,
although some will depart when the signal indicated clear for coded trains.
Why is that?