RRoad Rules Prep

Texas Impairment practice

Practice 68 Texas DMV questions on impairment. Answer interactively below with an instant explanation after every question.

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Example questions & answers

1

Which of the following is not a common effect of marijuana use on a driver?

  • A.Reduced ability to focus
  • B.Faster reaction time✓
  • C.Impaired night vision
  • D.Impaired sense of time, speed, and distance

Why: Marijuana is a substance that impairs the central nervous system, leading to slower physical and mental responses. It never improves reaction time; instead, it makes it much harder to respond quickly to road hazards.

2

Which drug is most frequently found in drivers involved in accidents, following alcohol?

  • A.cocaine.
  • B.cold or allergy medications.
  • C.marijuana.✓
  • D.pain relievers.

Why: Marijuana is the most frequently detected drug after alcohol in drivers involved in traffic accidents. It significantly impairs the cognitive and motor skills required to operate a vehicle safely.

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Practice material only — verify current rules with the Texas Department of Public Safety.