What is the significance of zigzag lines at a crossing?

Answer: B — No parking and no overtaking

Zigzag lines at a crossing typically indicate a no parking and no overtaking zone. This means that vehicles are not allowed to park or overtake other vehicles in this area. Option A, pedestrians having the right of way, is not correct as it usually is shown by a zebra crossing or pedestrian crossing sign. Option C, only emergency vehicles allowed, is incorrect as emergency vehicles typically have their own designated lanes or routes. Option D, decrease speed and prepare to stop, is also incorrect as no specific instructions are given by zigzag lines for speed or stopping.