Final answer:
White center lines on a road indicate two-way traffic and can also signify if passing is permitted or not. Solid white lines generally mean no passing, while broken lines may allow it.
Step-by-step explanation:
White center lines on the road indicate that there is two-way traffic, meaning that traffic flows in both directions. These lines help to maintain order and safety on the roads, ensuring drivers are aware of the flow of oncoming traffic. It's important to note that these lines can also signal whether passing is allowed or not. A solid white line typically means that passing is not allowed, while a broken white line may indicate that passing is permitted, provided it's safe to do so. Furthermore, understanding road signs and traffic signals is vital for pedestrian safety and to ensure smooth traffic flow, especially in busy intersections or where many students and pedestrians cross the road.