What do road markings primarily indicate in terms of vehicle movement?

Road markings primarily indicate traffic lanes, guiding the flow of vehicles on the road. They serve as visual cues that help drivers understand the rules of the road, including where to position their vehicles, how to change lanes safely, and when to stop or yield. These markings are essential for maintaining order on the roads and ensuring the safety of all users, as they delineate different lanes for vehicles traveling in the same or opposite directions. For instance, solid lines may indicate no passing zones, while dashed lines suggest that changing lanes is permitted. This clear demarcation helps prevent accidents and promotes smoother traffic flow, making it crucial for emergency response vehicle drivers to adhere to these guidelines while navigating roadways.