Final answer:
A green arrow over a lane typically indicates that the lane is designated for a specific type of traffic movement, such as a left turn or a right turn.
Step-by-step explanation:
A green arrow over a lane typically indicates that the lane is designated for a specific type of traffic movement, such as a left turn or a right turn. In most cases, the arrow indicates that traffic in that lane is allowed to proceed in the indicated direction. However, if the arrow is accompanied by a red circle or a red cross, it means that the movement indicated by the arrow is prohibited.
For example, if there is a green arrow pointing to the left over a lane, it means that vehicles in that lane can make a left turn. On the other hand, if there is a green arrow with a red circle over a lane, it means that the lane is prohibited for the indicated movement, such as making a left turn.
In summary, a green arrow over a lane indicates that the lane is designated for a specific type of traffic movement. The prohibition or permission of that movement depends on whether the green arrow is accompanied by a red circle or a red cross.