The Left Turn Across Two Oncoming Lanes
You are stopped in a designated 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 has two lanes. A large box truck in the near oncoming lane has stopped and the driver waves you through. You cannot see past the truck into the far oncoming lane. A pedestrian is waiting on the corner to your left, and a car behind you is honking.
1. Should you accept the truck driver's wave and turn?
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No. A wave from one driver says nothing about the far lane. The truck may be blocking your view of a vehicle approaching in the second lane, and that vehicle has the right-of-way. A solid green circle means you must yield to oncoming traffic and to pedestrians; it does not give you a protected turn. The correct move is to wait until you can see that both oncoming lanes are clear, then proceed when safe. The honking behind you does not create a right-of-way.
2. What role does the pedestrian play, and what if the pedestrian is slow to cross?
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The pedestrian in the crosswalk has the right-of-way over your turning vehicle. You must wait for the pedestrian to clear your path before completing the turn. If the pedestrian is slow, you still wait; you may not crowd or hurry them. If the light changes while you are waiting, complete your turn only when the way is clear and you are not blocking the intersection.