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

A solid red arrow in a traffic signal means the same thing as a circular red traffic light. When an arrow is red, traffic in the indicated lane must stop and may not turn in the direction that the arrow is pointing.

• Is never used as a traffic signal.
• Has the same meaning as a circular red traffic light.
• Means that drivers may turn in the direction indicated by the arrow.
• Means that the traffic the arrow is pointing toward must stop.