Weather fog and rain — Louisiana Permit Test
Weather fog and rain on the Louisiana permit test — 3 rules, each with the reason behind it and a question on it while it is fresh.
The rules
When driving in a heavy downpour or in fog, slow down and turn on your low beam headlights.
High beams bounce off rain and fog back into your eyes, while low beams light the road and help others see you.
When driving in a heavy downpour or in fog, slow down and turn on your low beam headlights.
If fog is so dense that it impairs your vision, you should not drive at all; if you must, slow down and get off the highway at the nearest place you can stop.
Creeping along in thick fog leaves you as a slow target that faster drivers behind cannot see in time.
If the fog is so dense that it impairs your vision, you should not drive at all.
In bad weather, tap your brakes to make drivers coming up behind you aware of your vehicle.
Flashing brake lights warn a driver who is going too fast that you are slowing ahead of them.
Tap your brakes to make these drivers aware of your vehicle.
On the test
Which headlights should you use when driving in fog or a heavy downpour?
Low beams. High beams bounce off rain and fog back into your eyes, while low beams light the road and help others see you. Class D & E Driver's Guide, p.106: “When driving in a heavy downpour or in fog, slow down and turn on your low beam headlights.”
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 Class D & E Driver's Guide, published by the Louisiana Department of Public Safety, and against the state code itself. Last checked 2026-10-04.
- src/assets/drivers-manuals/LA.pdf (Class D & E Driver's Guide, DPSMV2052 (R08/25), Louisiana Office of Motor Vehicles, retrieved 2026-09-14; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/LA.pages.txt (the plain pdftotext fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/LA-exam.html (the OMV's Permits page, https://expresslane.la.gov/omv/drivers/personal-driver-s-licenses/permits/, archived 2026-10-04; the 40-question count)
- https://expresslane.la.gov/omv/resources/driver-manuals/
- https://expresslane.la.gov/omv/drivers/personal-driver-s-licenses/new-licenses/ (read 2026-10-04; "An 80% is the minimum passing score for the knowledge test.")