The real Ohio knowledge test is the DMV exam used for a learner permit. This page contains one fixed 20 question slice of the full free 180 question bank, with an explanation after each answer.
Sample question from test 8
safe-driving
What is the Ohio minimum tread depth for a tire to be considered safe?
- 1/32 inch
- 1/8 inch
- 1/4 inch
- 1/16 inch
Answer: 1/16 inch. The Ohio manual says a tire in safe condition has at least 1/16 inch of tread depth on the road surface and no major bumps, bulges, breaks, or tread damage. The smaller 1/32-inch figure is below the manual's stated minimum, while the larger measurements are not the threshold given here. A practical check uses a penny in the deepest groove: if all of Lincoln's head is visible, the tire is too worn and should be replaced.