RRoad Rules Prep
Practice every question in the DC DMV Prep app — free on the App Store

District of Columbia Impairment practice

Practice 37 District of Columbia DMV questions on impairment. Answer interactively below with an instant explanation after every question.

Loading questions…

Example questions & answers

1

Which of the following is not a common effect of marijuana on a person's driving ability?

  • 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 drug that impairs driving by slowing down your physical and mental responses. It does not make you react faster; instead, it hinders your ability to respond to hazards.

2

What is the second most common drug, after alcohol, found in drivers involved in accidents?

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

Why: Marijuana is the most frequently detected drug, other than alcohol, in the systems of drivers involved in traffic accidents.

Take the full District of Columbia mock exam →

Practice material only — verify current rules with the DC Department of Motor Vehicles.