Lane signals are used:

To alert drivers to a warning sign.
To show when pedestrians may begin crossing the street.
To show which lanes are opened or closed.
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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