Final answer:
A solid yellow line with a broken yellow line in the center of a highway means that passing is allowed for the direction of the broken line while it is prohibited for the direction of the solid line to ensure road safety and manage traffic flow.
Step-by-step explanation:
A solid yellow line together with a broken yellow line marked on the center of a highway indicates that passing is permitted for traffic traveling in the direction of the broken line, but not for traffic flowing in the direction of the solid line. This type of road marking denotes a no-passing zone from the side with the solid line and a conditional passing zone from the side with the broken line, where drivers can pass other vehicles on the road if the lane is clear and such maneuver is safe and legal. It's important for drivers to understand these rules to maintain orderly traffic flow and ensure safety on the roads. Areas with such markings usually have differing traffic speeds, potential hazards or changes in road conditions, things that drivers should be aware of at all times. Examples where these lines might be relevant include approaching intersections, where traffic signals manage vehicle flow to prevent speeding or where road construction requires careful navigation to avoid hazards.