The Left Turn Across Two Lanes
You are stopped in a dedicated left-turn lane at a signalized intersection, waiting to turn left onto a four-lane road. The light for your direction is a solid green circle (not a green arrow). Oncoming traffic is steady, and a gap finally opens. Across the intersection, a pedestrian has just stepped into the crosswalk on the far side of the road you want to enter. A car behind you is close and has honked once.
1. May you turn left on the solid green circle now? What must you check before going?
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A solid green circle permits a left turn only after you yield to oncoming traffic and to pedestrians in the crosswalk. Even with the gap in oncoming traffic, the pedestrian now in the far crosswalk has the right of way, so you must wait until they clear your path. Confirm the oncoming gap is genuinely safe - not just that the nearest car is far, but that no vehicle is closing fast - and check for a second oncoming lane you might cross. The honk behind you does not change the law; do not let it rush you into an unsafe turn.
2. What does the honking driver behind you legally require you to do?
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Nothing. A driver behind you cannot confer or demand right of way, and you are not obligated to turn into a hazard to satisfy their impatience. Your duty is to yield to oncoming traffic and pedestrians. Proceed only when the path is clear; if the light changes to yellow while you wait, complete the turn safely once oncoming traffic has stopped, since you are already legitimately in the intersection.