What should you do if a car is stopped at a marked crosswalk for a pedestrian?

When a vehicle is stopped at a marked crosswalk for a pedestrian, it signifies that there is someone crossing or about to cross the road. The correct action in this scenario is to maintain safety and respect for the pedestrian right-of-way. Therefore, you should not attempt to pass the stopped vehicle.

Passing a vehicle near a crosswalk can create dangerous situations for both the pedestrian and other drivers. Traffic laws are designed to protect pedestrians, and this includes maintaining a safe distance from vehicles that yield to them. By adhering to the rule of not passing within a specified distance—30 metres in this case—you ensure the safety of everyone involved, allowing pedestrians to cross without additional hazards.

The context behind the other choices reinforces this. Accelerating to pass could lead to an accident, especially if the pedestrian is not visible to the driver. Honking at the stopped vehicle is unnecessary and could confuse or startle the pedestrian. Similarly, waiting until the pedestrian is halfway across does not guarantee safety and may still create risks if you're not giving the crosswalk situation the attention it requires. Thus, the focus should always be on caution and respect for pedestrians’ rights when navigating crosswalks.