Same function as the vertical signal but in a horizontal layout, often used in tunnels or on wide roadways.

Red and yellow together signal that the light is about to turn green. Do not move yet. Prepare to go.

Indicates that vehicles may proceed in the direction permitted, provided the intersection is clear.

Warns that the signal is about to turn red. Stop unless you are too close to the intersection to stop safely.

Red arrow upwards means vehicles must stop and cannot proceed straight ahead. No forward movement permitted.

Yellow upward arrow indicates the straight-ahead green light is ending. Be cautious and prepare to stop.

Protected left turn. Vehicles may turn left without yielding to oncoming traffic or pedestrians.

Often used in lane control systems. Indicates that vehicles in the designated lane must follow the shown direction.

Flashing green arrow allows turning even if the main light is red. Yield to all other road users before proceeding.