Clean windows — Kentucky Permit Test
Clean windows on the Kentucky permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
A dirty windshield decreases vision when bright sun or headlights fall on it, so Kentucky tells drivers to keep it clean.
The dirt is invisible until the sun is low, and then the whole windshield turns white.
Keep the windshield clean because bright sun or headlights on a dirty windshield decreases vision.
Kentucky tells drivers to remove snow, ice and frost from all windows before starting to drive.
Clearing a patch the size of a face leaves the driver blind to everything either side of it.
Remove snow, ice, and frost from all windows before you start to drive.
Nothing should be hung from the rearview mirror, and the windshield or rear window should not be cluttered with decals, because they are unlawful and block vision.
Anything dangling sits exactly where an oncoming car appears, and it is against the law besides.
Do not hang anything from your rearview mirror. Do not clutter up the windshield or rear window with decals. They are unlawful and block your vision.
Excessive window tinting is not allowed in Kentucky.
Tint that looks good in a parking lot is what stops a driver seeing a cyclist at dusk.
Excessive window tinting is not allowed.
Kentucky tells drivers to keep the windshield washer fluid container full, which during winter also helps to prevent freezing.
Running out of washer fluid on a salted road leaves a driver looking through a film they cannot clear.
Keep your windshield washer fluid container full. During winter, this will also help to prevent freezing.
On the test
Why does Kentucky say to keep the windshield clean?
Because bright sun or headlights on a dirty windshield decrease vision. The dirt is invisible until the sun is low, and then the whole windshield turns white. Kentucky Driver Manual, p.29: “Keep the windshield clean because bright sun or headlights on a dirty windshield decreases vision.”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
- One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
- Free to start: a 10-question test and the first section of cards. No sign-up and no account.
- Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
- Every level up to Prepared — 3 tests passed in a row.
- Do the work, fail the real exam, and we refund you.
Where these come from
Every rule here is checked against Kentucky Driver Manual, published by the Kentucky Transportation Cabinet, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/KY.pdf (Kentucky Driver Manual, Kentucky State Police / Kentucky Transportation Cabinet, retrieved 2026-09-14; no edition statement in the document)
- src/assets/drivers-manuals/KY.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 8, folioMarker, nonLawPages, the extraction flag and knowledgeTestBasis, each with its basis)