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BDifficulty 3/5

What change in the useful field of vision is associated with the tunnel effect as speed increases?

Correct answer

It narrows and side hazards become harder to perceive.

Its width decreases, making hazards at the sides of the road harder to perceive. The DGT explains that this narrowing of the useful field of vision reduces the information available to anticipate risks, especially at junctions. It does not mean side hazards become easier to see or that checking them is no longer necessary. Maintain an appropriate speed and scan the surroundings broadly.

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  • It always remains identical, regardless of speed.

  • It widens and allows better perception of every side hazard.

  • It narrows and side hazards become harder to perceive.

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