Large vehicles and trucks — California Permit Test
Large vehicles and trucks on the California permit test — 9 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Large vehicles and trucks have large blind spots called No Zones, and if you cannot see the truck’s side mirrors the truck driver cannot see you.
The mirror test works both ways, which makes it the one check a driver can actually perform.
If you cannot see the truck’s side mirrors, the truck driver cannot see you.
An average passenger vehicle traveling at 55 mph can stop within 300 feet.
That is the distance the road gives you back once you have hit the brake.
The average passenger vehicle traveling at 55 mph can stop within 300 feet.
A large vehicle traveling at 55 mph can take up to 400 feet to stop.
That is a hundred feet more than your own car, and the hundred feet is where you would be.
A large vehicle traveling at the same speed can take up to 400 feet to stop.
The heavier the vehicle and the faster it is moving, the longer it takes to stop, so a loaded truck takes longer to stop than an empty one.
Weight is what the brakes have to fight, and a full trailer is many times an empty one.
The heavier the vehicle and the faster it is moving, the longer it takes to safely stop, so a loaded truck will
Do not move in front of a large vehicle and then suddenly slow down or stop, because it will not be able to stop fast enough to avoid crashing into you.
You are asking a truck to do in a hundred feet what needs four hundred.
Do not move in front of a large vehicle and suddenly slow down or stop.
When a vehicle turns, the rear wheels follow a shorter path than the front wheels, which is why large vehicles and trucks must often swing wide to complete a turn.
The back of the trailer cuts the corner the front went round, so it needs the extra room.
When a vehicle turns, the rear wheels follow a shorter path than the front wheels.
When you follow a large vehicle, look at its turn signals before you start to pass, because it may appear to turn one way while swinging wide the other.
The nose going right can be the start of a left turn, and the signal is the only thing that says so.
When you follow a large vehicle,
On a divided highway with four or more traffic lanes in one direction, large vehicles and trucks may be driven in the two lanes farthest to the right.
Keeping them right keeps the faster lanes clear of vehicles that cannot change speed quickly.
On a divided highway with four or more traffic lanes in one direction, they may be driven in the two lanes farthest to the right.
Do not drive next to a large vehicle longer than you need to, and always pass a large vehicle on the left, moving ahead of it once you are past.
Alongside a truck you are in a blind spot with a wall of metal on one side.
Always pass a large vehicle on the left side.
On the test
How can you tell whether a truck driver can see you?
If you can see their side mirrors. The mirror test works both ways, which makes it the one check a driver can actually perform. California Driver’s Handbook, p.42: “If you cannot see the truck’s side mirrors, the truck driver cannot see you.”
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 California Driver’s Handbook, published by the California Department of Motor Vehicles, and against the state code itself. Last checked 2026-09-21.
- src/assets/drivers-manuals/CA.pdf (California Driver’s Handbook, DL 600 ENGLISH (REV. 6/2025), retrieved 2026-09-14; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/CA.pages.txt (the pdftotext -layout fixture every citation here was cut against and verified against; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json, CA entry — the folio offset of 6 and its basis, the three non-law pages, the two sign gallery pages, and the record of why California’s exam shape is this app’s own
- docs/plans/chosen-exam-shapes.md section 5 — the decision that a state publishing neither exam figure ships 40/32 with both disclosed
- docs/plans/how-to-build-laws.md — the rule that the handbook is the syllabus and nothing enters this file without a page in it