Within a built-up area, can short-range or long-range lights be used alternately at very short intervals?
A)No, it is prohibited.
B)Never within a built-up area; outside one, yes.
C)Yes, to avoid a possible accident.Correct
High-beam lights may be used both day and night in the form of warning flashes, at very short intervals and always avoiding dazzling others, in order to: avoid a possible accident, when performing an urgent service, on narrow roads with many bends, and to warn of an overtaking manoeuvre.