You are driving car A. Car B ahead of you has slowed down before a pedestrian crossing. What must you do?
Explanation
If a vehicle ahead in the same direction slows down or stops before a pedestrian crossing, the drivers behind must do the same. A stopped vehicle can hide a pedestrian you are required to let pass.
KET reference: KET 31: If a vehicle has slowed down before a pedestrian crossing, a driver in the same direction must slow down or stop, and may move off again only after making sure there is no pedestrian on the crossing.