The use of alcohol and/or drugs affects:

Vision.
Concentration and reaction time.
Alertness and judgement.
All of the above.
Explanation

Alcohol reduces all of the important skills necessary to safely operate a vehicle, such as judgment, concentration, reaction and vision. Besides alcohol, many drugs can affect your ability to drive safely. This is true for many prescription drugs, as well as over-the-counter medications. Mixing drugs and alcohol often multiplies the effects of the alcohol and any other drugs. Do not consume alcohol and drugs at the same time.

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