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

Oklahoma Impairment practice

Practice 62 Oklahoma DMV questions on impairment. Answer interactively below with an instant explanation after every question.

Loading questions…

Example questions & answers

1

What is the legal blood alcohol content (BAC) limit for drivers who are 21 years old or older?

  • A.0.10% or less.
  • B.less than 0.12%.
  • C.0.09% or less.
  • D.less than 0.08%.✓

Why: According to the Oklahoma driver's manual, your license will be revoked if your blood alcohol content (BAC) is 0.08% or higher. Therefore, the legal limit to drive is strictly less than 0.08%. This applies to drivers who are 21 or older, as those under 21 cannot have any measurable amount.

2

Which of the following is not a typical effect of marijuana on your driving?

  • 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 rather than faster ones. The Oklahoma Driver Manual notes that marijuana users make more driving mistakes and have significant trouble adjusting to glare, which negatively impacts safety.

Take the full Oklahoma mock exam →

Practice material only — verify current rules with the Service Oklahoma.