Reserved lanes — Iowa Permit Test
Reserved lanes on the Iowa permit test — 3 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Reserved lanes are often marked with a white diamond on a sign at the side of the road or painted on the road.
The diamond tells you the lane is kept for special vehicles, such as buses or cars with riders.
Reserved lanes are marked by signs stating that the lane is reserved for special use, and often have a white diamond posted at the side of the road and/or painted on the road surface.
Do not travel in a reserved lane unless you are driving the type of vehicle it is reserved for.
These lanes keep buses and shared rides moving. A driver who does not belong there slows them down.
Do not travel in one of these lanes unless operating that type of vehicle.
An HOV 2+ lane is reserved for high-occupancy vehicles carrying 2 or more people.
The lane rewards people who share a ride. Driving alone in it is against the rule.
In this example, the lane is reserved for high-occupancy vehicles (HOV) carrying two or more people.
On the test
A white diamond painted in a lane usually means what?
The lane is reserved for special use. The diamond tells you the lane is kept for special vehicles, such as buses or cars with riders. Iowa Driver's License Manual, p.16: “Reserved lanes are marked by signs stating that the lane is reserved for special use, and often have a white diamond posted at the side of the road and/or painted on the road surface.”
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 Iowa Driver's License Manual, published by the Iowa Department of Transportation, and against the state code itself. Last checked 2026-10-04.
- src/assets/drivers-manuals/IA.pdf (Iowa Driver's License Manual, edition M1170 07/23/2026, Iowa Department of Transportation, retrieved 2026-09-14; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/IA.pages.txt (the plain pdftotext fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- https://iowadot.gov/drivers-licenses-ids/driver-education/manuals-practice-tests/drivers-manual
- https://iowadot.gov/drivers-licenses-ids/driver-education/online-permit-test-skip-trip (read 2026-10-04; states no count or mark)
- https://iowadot.gov/drivers-licenses-ids/get-or-renew-drivers-licenses-ids-permits/under-18-permit-license-or-id/instruction-permit-under-age-18 (read 2026-10-04; states no count or mark)
- https://iowadot.gov/drivers-licenses-ids/driver-education/manuals-practice-tests/take-practice-test (read 2026-10-04; its 25 questions and 80% describe the practice test and are not used)
- https://www.legis.iowa.gov/docs/iac/chapter/761.604.pdf (IAC 10/1/25; 761-604.9(1): "will declare the minimum passing score for each test")
- docs/plans/iowa-exam-shape.md (every official source checked for the exam's shape, and what each gave)