For Ohio permit preparation, memorize each number with the situation that makes it apply. A parking clearance, a school-zone speed and a passing score answer different questions. Use the official Ohio handbook and laws below to keep similar-looking numbers from becoming interchangeable answers.
Last verified: November 4, 2026
Build your Ohio car knowledge with focused practice and explanations.
What score do you need on the Ohio knowledge test?
The Ohio examination rule requires 75% correct in the rules portion and 75% in the signs portion. With the standard 20 questions per part, that means at least 15 correct in each. The full examination contains 40 questions, but both parts must pass independently.
| Item | Number to remember | Condition |
|---|---|---|
| Rules portion | 15 correct out of 20 | Standard section size |
| Signs portion | 15 correct out of 20 | Must pass separately |
| Complete examination | 40 questions | A combined total does not override a failed part |
Study signs and road rules in separate review sessions before mixing them. If your errors cluster in signs, another high road-rules result does not show that problem has been repaired. The Ohio written-test guide explains the application and testing routes.
Which speed numbers belong on your review sheet?
Ohio’s speed law sets a 20 mph school-zone rule during the specified school activity periods when the required signs are erected. It also provides a 25 mph category for municipal areas outside the listed exceptions. Higher limits depend on roadway classifications, designated zones and posting.
| Setting | Study point |
|---|---|
| Active signed school zone | 20 mph under the statutory conditions |
| Applicable municipal category | 25 mph, with statutory exceptions |
| Other road and freeway categories | Match the statute and actual signs; do not assume one statewide highway limit |
School-zone flashing lights are not required to establish the statutory school-zone conditions. Read the sign, activity and location rather than assuming that no flashing light means the ordinary speed is always available. In every setting, slow further when conditions require it.
What following space does the Ohio handbook recommend?
The Ohio Driver Manual teaches a following interval of at least four seconds in its following-space guidance. Use a stationary roadside reference to measure the gap after the vehicle ahead passes it. Increase space when visibility, traction or the traffic situation requires more room.
That interval is a starting safety technique, not permission to ignore a hazard. Snow, ice, a blocked view or a motorcycle ahead can require additional space. Your speed must also allow stopping within the assured clear distance ahead under Ohio law.
When driving under icy or snowy conditions, which driving technique will help drivers avoid crashes?
- A. Add extra weight to their vehicles to improve traction.
- B. Get off the highways as quickly as possible.
- C. Engage the four-wheel drive on their vehicles.
- D. Reduce their speed and increase their following distance.
Show answer
D. Reduce their speed and increase their following distance. Lower traction makes stopping and steering less forgiving. Leave more response space and choose a speed suited to the surface instead of relying on vehicle features.
What parking distances apply in Ohio?
Ohio’s parking law prohibits standing or parking within the clearances below, subject to its stated exceptions. Keep the location attached to the number. A space being large enough for your car does not make parking there lawful.
| Location | Prohibited clearance |
|---|---|
| Fire hydrant | Within 10 feet |
| Crosswalk at an intersection | Within 20 feet |
| Approach to a yield sign, stop sign or highway traffic signal | Within 30 feet |
| Nearest rail of a railroad crossing | Within 50 feet |
Also avoid sidewalks, intersections and blocked driveways as the law requires. Read curb markings and signs before estimating any distance. Emergency access and sight lines are the purpose of these clearances, not simply a measurement exercise.
Which alcohol thresholds should you distinguish?
Ohio’s OVI law includes 0.08% whole-blood alcohol for ordinary OVI and an under-21 provision beginning at 0.02% and below 0.08%. Higher underage results fall within other applicable OVI provisions. Serum, breath and urine use their own statutory units and thresholds.
Do not treat a number below a threshold as proof of safe driving. Impairment from alcohol or drugs is separately prohibited. Arrange a sober ride rather than converting this study table into a drink-counting plan.
How should you use the numbers before testing?
- State the condition before recalling the number.
- Keep signs and rules passing standards separate.
- Slow below a maximum when hazards require it.
- Increase following space as conditions worsen.
Review the official Ohio manual once before testing, then use the study plan and Ohio Car hub for the rest of your preparation.
Build your Ohio car knowledge with focused practice and explanations.
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