Traffic signals sometimes display arrows to control turns from specific lanes. A green arrow:

A green arrow has the same meaning as a circular green traffic light, but traffic in the indicated lane must turn in the direction shown by the arrow.

• Is used only on one-way streets.
• Has the same meaning as a circular green traffic light, but traffic must turn in the direction indicated by the arrow.
• Means that you may proceed, but only if the green arrow is accompanied by a circular green light.
• Points the way to an airport.