Final answer:
Lane-use lights are traffic control devices that indicate if a lane is open, closed, or restricted. Green arrows signify an open lane, red 'X' means a lane is closed, and a yellow 'X' or other symbols can signal restrictions.
Step-by-step explanation:
The student's question asks about the function of lane-use lights in traffic control. These special overhead lights are designed to manage traffic flow by indicating which lanes of a highway or road are available for drivers to use. Lane-use lights display different symbols or colors to convey their messages.
Typically, a green arrow indicates that the lane is open for use, while a red 'X' signifies that the lane is closed. In addition, a yellow 'X' or other symbols may indicate that a lane is restricted for use by certain vehicles or during specific times. Therefore, the lane-use lights indicate which lanes are open, closed, or restricted at any given time.