You're approaching a red light at a puffin crossing. Pedestrians are on the crossing. When will the red light change?
  1. When you start to edge forward onto the crossing
  2. When the pedestrians have cleared the crossing
  3. When the pedestrians push the button on the far side of the crossing
  4. When a driver from the opposite direction reaches the crossing
Explanation
Answer-B. A sensor will automatically detect that the pedestrians have reached a safe position. Don't drive on until the green light shows, and it's safe for you to do so.
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