Correct answer
A reduction in the visual field.
It can narrow the visual field and make peripheral objects harder to perceive, as well as impairing other aspects of vision and attention. Effects vary with dose and person and may go unnoticed by someone who has been drinking. This does not improve driving, and feeling fine should not be relied on. The safe recommendation is not to drink before driving.
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A guaranteed widening of the visual field.
A reduction in the visual field.
A guaranteed improvement of all driving ability.
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