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Difficulty: MediumPedestrian Crossings

When a pedestrian activates a Puffin crossing, the signals for vehicular traffic change in a specific cycle. Arrange the following signal phases in the correct chronological order, starting from the first light change that indicates drivers must prepare to stop.

  1. 1A steady amber light illuminates alone
  2. 2A steady red light illuminates alone
  3. 3Red and amber lights illuminate simultaneously
  4. 4A steady green light illuminates alone

Answer

The correct chronological sequence is: (1) A steady amber light illuminates alone, (2) A steady red light illuminates alone, (3) Red and amber lights illuminate simultaneously, (4) A steady green light illuminates alone.
Puffin (Pedestrian User-Friendly Intelligent) crossings use standard UK traffic signal sequences without a flashing amber stage. When triggered, the sequence begins with a steady amber light (stopping warning), followed by a steady red light (stop). After the crossing clear time managed by infrared sensors, red and amber illuminate together to signal preparation, before finally returning to steady green.

Step-by-Step Solution

1
Identify the initial transition from green
Steady amber illuminates alone
When a Puffin crossing changes from green, steady amber shows first to instruct drivers to stop if safe to do so.
2
Identify the mandatory stopping phase
Steady red illuminates alone
Steady red follows amber to bring all traffic to a halt while pedestrian sensors monitor the crossing.
3
Identify the preparatory phase before traffic moves
Red and amber illuminate simultaneously
Unlike Pelican crossings with flashing amber, Puffin crossings use the standard UK red-and-amber phase before green.
4
Identify the final phase allowing traffic to proceed
Steady green illuminates alone
Steady green illuminates once the red-and-amber phase finishes and the crossing is clear.

Key Concept

Puffin crossing traffic signal cycle sequence
Estimated Time:1m 0s
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Topics

Pedestrian Crossings

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