In this situation, should you use the sound or light signal when approaching the pedestrian crossing?

According to the regulations, an audible or visual signal may only be used to warn of a hazard. In a built-up area, the use of the audible signal is only permitted in the event of an immediate hazard. In the situation shown, the pedestrians are standing calmly on the pavement and do not pose a hazard, therefore the use of a warning signal is unjustified and prohibited.