When are lane signals used?

When the direction of the flow of traffic changes during the day.
To show which lanes are opened or closed.
To show that a toll booth is open or closed.
All of the above.
Explanation

Lane signals are used when the direction of the flow of traffic changes during the day. They are also used to show if a toll booth is open or closed, and to indicate which lane(s) drivers may travel in.

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