What are used to indicate a change in direction of traffic, or lane or toll booth opening or closing?

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Lane signals communicate lane status in real time, showing whether a specific lane is open, closed, or directing you to change lanes. They’re used on highways with multiple lanes that can change direction or be opened or closed, such as reversible lanes or toll plazas, where a lane might be opened or closed to manage traffic flow. You’ll often see overhead signals above lanes with indicators like arrows for open lanes or Red X for closed ones, guiding you to the correct lane. Road signs give general information, warnings, or rules; traffic lights control movements at intersections; stop lines mark where you must stop. The lane signals are the direct tool to indicate which lanes you may use and when a lane or toll booth is available.