Final answer:
A white two-way left-turn arrow over a lane is a traffic sign that allows vehicles to turn left in both directions at an intersection or where a median separates opposing lanes of traffic.
Step-by-step explanation:
A white two-way left-turn arrow over a lane is a traffic sign that indicates a lane designated for vehicles to turn left in both directions. It is typically found at intersections or areas where a median separates opposing lanes of traffic. This sign allows vehicles to safely make left turns without conflicting with oncoming traffic.
For example, if you are driving in a lane with a white two-way left-turn arrow, you can turn left even if there is oncoming traffic, as long as it is safe to do so.
It is important to always follow the signs and signals on the road to ensure safe and efficient traffic flow.