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The Red Light (illustration)
FILE No.133Unsolved

The Red Light

Difficulty ★☆☆about 5 minEveryday MysteryObservationAssumptions
Taro stopped at a red light and was yelled at by the car behind. Why?

Case Record

Taro was driving when he saw a red light at an intersection and stopped. But the driver of the car behind yelled, "Move it!"

Your question

Why?

Case Files

Diagram

The intersection (seen from above)TaroLight ALight BTaro "saw a red light" and stopped. The driver behind shouted, "Go!"
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Does it say it was the light on Taro's side?

Open hint 2

How many signals are there at one intersection?

Open hint 3

What is the person behind angry about?

Solve It

Your question

Why?

Choose the answer closest to the truth.

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The Truth

The light Taro saw was for a different road; the light on his side was green

The answer is "The light Taro saw was for a different road; the light on his side was green."

The problem says only that "he saw a red light." Taro probably stopped after looking at the signal for the crossing road. The signal on his own side was green, so the car behind wanted to go.

Mere impatience would not explain being yelled at.

He looked at the wrong lightTaroLight ALight BTaro stopped for the red light of the crossing road. His own light (A)was green, so the car behind wanted to go.
Diagram of the solution

Key Points

  • Do not assume what is not written
  • An intersection has several signals
  • Think from the reason for the anger

Why people get fooled

Because you assume "red light means stopping is correct."

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