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If traffic lights at an intersection are out of order, you should...?

  1. Proceed with caution

  2. Yield to vehicles on your left

  3. Yield to vehicles from your right

  4. Stop indefinitely

The correct answer is: Yield to vehicles from your right

When a traffic signal is not functioning, you should treat the intersection as a four-way stop, which means that you should yield to vehicles on your right. Vehicles already at the intersection or approaching from your right have the right-of-way, so it's important to be cautious and yield to them. Proceeding with caution (A) is not enough because it may result in a collision with another vehicle. Yielding to vehicles on your left (B) is incorrect because they do not have the right-of-way in this situation. Stopping indefinitely (D) is also incorrect because you should only stop temporarily to yield to other vehicles and then proceed with caution. Remember, treat a non-functioning traffic signal as a four-way stop and always yield to vehicles on your right.