How should you behave when forced to continue driving behind a driving lesson vehicle, without the possibility of overtaking?

A vehicle marked with the letter "L" is being driven by a person who is learning, whose behaviour on the road may be unpredictable and uncertain. The driver of such a vehicle may, for example, brake suddenly without an obvious reason or commit other errors in driving technique. Therefore, to ensure safety, it is crucial to maintain a greater distance than usual, which provides more time for an appropriate reaction.