Following distance four second — Louisiana Permit Test
Following distance four second on the Louisiana permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Increase your following distance to 4 seconds during bad weather or when driving on wet pavement.
Wet roads make tires slip, so you need more room to stop than on a dry day.
Increase the following rule (above) to four (4) seconds during bad weather or when driving on wet pavement.
If another vehicle moves into the space between you and the car ahead, drop back to a safe following distance.
When someone cuts in, your safe gap is gone, and you must build it back before the next stop.
If another vehicle moves into the space between your car and the one ahead, drop back to a safe following distance.
Leave extra following distance behind motorcycles, because if the rider falls you need room to avoid them.
A rider who falls is right in your path, and only extra space lets you stop or steer around them.
If the motorcycle and its’ rider should fall; you need extra distance to avoid the obstacle.
Truck, bus, van and trailer drivers may not see you directly behind them, and large vehicles block your view ahead, so fall back.
A big rig can hide a stopped car from you, and its driver may not know you are there.
The drivers of trucks, buses, vans or vehicles pulling campers or trailers may not be able to see you when you are directly behind them.
Leave extra space when stopped on a hill or incline, because the vehicle ahead may roll back when it starts up.
A car starting on a hill can slip back a few feet before it moves forward, right into your bumper.
Leave extra space when stopped on a hill or incline. The vehicle may roll back when it starts up.
Pulling a trailer increases stopping distance because of the combined weight of the vehicle and trailer.
More weight takes more road to stop, so you need more room in front when you tow.
The combined weight of a vehicle and trailer increases the stopping distance.
On the test
How many seconds of following distance should you keep on wet pavement?
4 seconds. Wet roads make tires slip, so you need more room to stop than on a dry day. Class D & E Driver's Guide, p.66: “Increase the following rule (above) to four (4) seconds during bad weather or when driving on wet pavement.”
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
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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.")