Interstate space cushion — Louisiana Permit Test
Interstate space cushion on the Louisiana permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.
The rules
On the interstate, always keep at least a 4-second space cushion between you and the vehicle ahead.
Drivers slowing for exits can brake suddenly, and a big gap gives you time to stop behind them.
Always keep at least a four seconds space cushion between you and the vehicle ahead.
Rear-end collisions are the most frequent type of crash on the interstates.
Most of these crashes come from following too close, which is why the manual stresses a large gap.
Rear-end collisions are the most frequent type of crashes on the interstates.
If you are being tailgated, slow down and encourage the driver behind to pass; if that fails, pull over, stop and let them pass.
Getting the tailgater in front of you removes the danger of being hit from behind when you brake.
If you are being followed too closely (tailgated), slow down and encourage the driver behind you to pass.
Even when someone is too close behind you, keep a safe following distance behind the vehicle ahead.
If you are hit from behind, the space ahead keeps you from being shoved into the car in front.
You should still keep a safe following distance behind the vehicle ahead of you.
Avoid driving alongside other cars on multi-lane streets.
A car riding beside you blocks your escape to that side if something goes wrong ahead.
Avoid driving alongside other cars on multi-lane streets.
Make room for vehicles entering the interstate: if no one is next to you, move over a lane.
Moving over lets ramp traffic join without having to stop or squeeze in front of you.
If there is no one next to you, move over a lane.
On the test
On the interstate, what is the least space cushion you should keep behind the vehicle ahead?
4 seconds. Drivers slowing for exits can brake suddenly, and a big gap gives you time to stop behind them. Class D & E Driver's Guide, p.101: “Always keep at least a four seconds space cushion between you and the vehicle ahead.”
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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- 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.")