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The Signal at the Red Light (illustration)
FILE No.2Unsolved

The Signal at the Red Light

Difficulty ★☆☆about 3 minEveryday MysteriesChanging the situationLateral thinking
On a rainy night, you notice the car beside you has no headlights on. You cannot get out. What did you do?

Case Record

On a night after rain, I stopped at a red light on my way home. Glancing over, I saw that the car stopped slightly behind in the right lane had no headlights on. The street lamps and shop signs were bright, so the driver didn’t seem to notice.

There was no time to get out and tell them. The pedestrian light was already flashing green. I hoped the car right behind me would do something, but it showed no sign of moving. So I tried something on the spur of the moment. In the few seconds before the light changed, that car’s lights came on, and I drove off, relieved.

Your question

Which of the following did I try?

Case Files

Evidence

Diagram

Diagram

Timeline

  1. Stop at a red light.
  2. You notice the lights are off on the car behind to the right.
  3. The pedestrian signal starts flashing.
  4. “I” do something.
  5. The lights of the car behind to the right come on.
  6. The light turns green; you drive off.

Hints

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

Open hint 1

You are telling only one car, but what moves is “everything around.”

Open hint 2

What the other driver hasn’t noticed is that their own lights are off.

Open hint 3

What if a world where lights are on suddenly looked different?

Solve It

Your question

Which of the following did I try?

Choose the answer closest to the truth.

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The Truth

I turned off my own headlights

The answer is: I turned off my own headlights.

When the lights of a car near the front go out, the cars around it follow and turn theirs off as well, and the intersection suddenly gets dark. Then the driver who had not turned the lights on feels “darker than usual” and checks the switch. Even if you cannot tell someone directly, you can change the surroundings so they notice.

Make the dark noticeableYou turn off your own headlightsCars around follow; the intersection suddenly looks darkThe driver feels “darker than usual” and checks the switchAnswer: turn off your own headlights
Diagram of the solution

Key Points

  • If you cannot tell them directly, change the environment so they notice
  • Read the assumption that “those around you will follow”
  • You tend to think of sounds and signals, so beware of being misled

Why people get fooled

Because the goal is “to tell them,” you imagine sounds and signals. Changing the surroundings themselves is hard to think of as an option.

Similar tricks

  • Making someone notice by changing the situation
  • Reasoning that counts on how others react

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