Following distance — California Permit Test
Following distance on the California permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Use the three-second rule to keep a safe following distance and avoid a collision.
Three seconds is how long it takes to see a problem, decide, and get on the brake.
Use the three-second rule to ensure a safe following distance and avoid a collision.
Tailgating makes it harder to see the road ahead, because the vehicle in front blocks your view, and leaves you no time to react if they brake suddenly.
From close behind, the car in front is the whole of your view of the road.
Tailgating makes it harder for you to see the road ahead because the vehicle in front of you blocks your view.
If a vehicle merges in front of you too closely, take your foot off the accelerator to create space between you and the vehicle ahead.
Lifting off is enough. Braking hard hands the problem to whoever is behind you.
If a vehicle merges in front of you too closely, take your foot off the accelerator.
When a tailgater is behind you, maintain your course and speed, then when it is safe merge right to change lanes and let them pass.
Nothing you do in front of a tailgater fixes them. Letting them past does.
A tailgater is behind you. Maintain your course and speed. Then,
Create more space in front of your vehicle when following motorcyclists on metal surfaces such as bridge gratings or railroad tracks, and on gravel.
Metal and gravel take the grip out from under a motorcycle without warning.
Following motorcyclists on metal surfaces (bridge gratings, railroad tracks, etc.), and gravel.
On the test
Which rule sets your following distance?
The three-second rule. Three seconds is how long it takes to see a problem, decide, and get on the brake. California Driver’s Handbook, p.57: “Use the three-second rule to ensure a safe following distance and avoid a collision.”
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