Center turn lanes — Colorado Permit Test
Center turn lanes on the Colorado permit test — 3 rules, each with the reason behind it and a question on it while it is fresh.
The rules
A two-way left-turn lane is for the exclusive use of left turning vehicles and may be used by drivers turning left in either direction.
Both directions share it, so a driver in it is always facing somebody who may enter it head-on. It is only safe used for a few seconds at a time.
This lane is for the exclusive use of left turning vehicles and may be used by drivers making a left turn in either direction
A two-way left-turn lane must not be used for passing or for travel except to make a left turn, though you may stop in it until it is safe to complete the turn.
Driving along it means meeting somebody coming the other way in the same lane. Stopping in it to wait for a gap is what it is for.
It shall not be used for passing or travel by a driver except to make a left turn
Where a street has a shared center turn lane, you may not turn left from any other lane.
Turning left out of a through lane surprises the driver behind you, who had no reason to expect it. The center lane is where the turn belongs.
When a street has a shared center turn lane, you may not turn left from any other lane and you may not drive in this lane
On the test
Who may use a two-way left-turn lane?
Drivers turning left from either direction. Both directions share it, so a driver in it is always facing somebody who may enter it head-on. It is only safe used for a few seconds at a time. Colorado Driver Handbook, p.10: “This lane is for the exclusive use of left turning vehicles and may be used by drivers making a left turn in either direction”
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)