During traffic congestion, what parts of the road infrastructure must be kept clear?

You answered correctly that during traffic congestion, traffic confluences and pedestrian crossings must be kept clear. This is because blocking these areas can cause further traffic jams and endanger pedestrians trying to cross the road. Traffic confluences (where roads merge or intersect) need to stay clear to allow smooth merging and flow of vehicles. Pedestrian crossings must remain accessible so pedestrians can cross safely without being forced into traffic. Bus stops, however, can be temporarily blocked if necessary, as buses can wait briefly without causing major safety issues. Keeping these key areas free helps maintain order and safety even when traffic is heavy.