Lane signals are used:

To show which lanes are opened or closed.
To show when pedestrians may begin crossing the street.
To alert drivers to a warning sign.
None of the above.
Explanation

Lane signals are used when the direction of the flow of traffic changes during the day. They indicate whether a toll booth is open or closed and which lanes are open or closed. Drivers should never travel in a lane with a red X; instead, they should use the lane with a green arrow. If there is a yellow X above a lane, it means that the lane signal is about to turn red.

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