Are you obliged to maintain cautious approach towards pedestrians walking on the pavement?

The principle of limited trust applies when the behaviour of another road user or the situation on the road indicates that they may not comply with the regulations. In the situation shown, the pedestrians are moving correctly on the pavement, i.e., in the place designated for them, and nothing indicates that they might suddenly step onto the carriageway. Therefore, there is no obligation to apply the principle of limited trust to them.