Final answer:
Pedestrians should walk facing oncoming traffic on roads without sidewalks for visibility and safety. Traffic signals and road layouts in cities dictate zigzagged pedestrian paths and ensure safe crossing at intersections.
Step-by-step explanation:
If there is no sidewalk along a road, pedestrians should walk on the side of the road facing oncoming traffic. This is to ensure that they are visible to drivers and can react to any potential hazards approaching from the opposite direction. It's important for safety reasons that pedestrians stay alert and make themselves as visible as possible when walking along roads without sidewalks.
Furthermore, in cities with uniform square blocks like New York, pedestrians and drivers must follow two-dimensional, zigzagged paths to reach their destinations. This requirement is due to the layout of the streets and the need to follow traffic signals and pedestrian safety rules. When safety measures, such as traffic signals, are in place, they help pedestrians cross intersections at appropriate times, minimizing the risk of accidents.