Lane use — Colorado Permit Test
Lane use on the Colorado permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
As a general rule you must drive on the right half of the road, use only one lane, and not straddle lanes.
Everything else on the road is built on that one rule. A car straddling a line leaves no lane for anyone to pass in.
As a general rule, you must drive your vehicle on the right half of the road. Use only one lane, do not straddle lanes
On roads without marked lanes, drive just to the right of the center of the road.
With no paint to go by, both drivers need the same habit. Keeping right of center is what leaves room for the car coming the other way.
On roads without marked lanes, drive just to the right of the center of the road
Where there are no signs or pavement markings controlling lane use, you must not drive on the shoulder of the road.
The shoulder is where a broken-down car sits and where someone walks when there is no sidewalk. It is not a spare lane.
Unmarked lane: When there are no signs or pavement markings to control the use of lanes, drive just to the right of the center of the road
The same rules for passing and turning on marked roads apply on unmarked roads.
A road without paint is not a road without rules. Drivers who treat it that way meet somebody who did not.
The same rules for passing and turning on marked roads apply with unmarked roads
On the test
What is the general rule about which part of the road to drive on?
Drive on the right half, in one lane. Everything else on the road is built on that one rule. A car straddling a line leaves no lane for anyone to pass in. Colorado Driver Handbook, p.9: “As a general rule, you must drive your vehicle on the right half of the road. Use only one lane, do not straddle lanes”
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 Colorado Driver Handbook, published by the Colorado Division of Motor Vehicles, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/CO.pdf (Colorado Driver Handbook, DR 2337 (12/05/24), Colorado Division of Motor Vehicles, retrieved 2026-09-14 from dmv.colorado.gov/publications)
- src/assets/drivers-manuals/CO.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 3, folioMarker, the extraction flag and the four trap measurements, each with its measured basis)
- 1 CCR 204-30, Rule 8 (402)(B)(4), the Colorado Department of Revenue rule stating the 80% pass mark for the DR 2252WE Driver's License Written Examination, read 2026-09-16 at law.cornell.edu/regulations/colorado/1-CCR-204-30-8
- docs/plans/colorado-exam-shape.md (what was searched and came up empty, and the 30-question practice quiz that must not become the exam's count)
- docs/work/colorado-corpus/plan.md (why the 40-question count was chosen, and the two figures it refused)