Interstate passing — District of Columbia Permit Test
Interstate passing on the District of Columbia permit test — 3 rules, each with the reason behind it and a question on it while it is fresh.
The rules
On a District interstate it is legal to pass on the left or the right, but most passing should be on the left.
With slow traffic kept to the right, the left lane stays clear for passing and drivers know where to expect it.
It is legal in the District of Columbia to pass on the left or on the right, but slow moving vehicles must stay in the right lane.
Never cruise in the blind spot of the vehicle ahead of you.
A driver who cannot see you in their mirror may change lanes straight into your car.
Never cruise in the blind spot of the vehicle ahead of you
Before changing lanes, check your blind spots by glancing over your shoulder.
Mirrors leave a gap beside the car big enough to hide another vehicle, and a glance over the shoulder shows it.
Check your blind spots by glancing over your shoulder
On the test
On an interstate in the District, where should most of your passing be done?
On the left. With slow traffic kept to the right, the left lane stays clear for passing and drivers know where to expect it. DC Driver Manual, p.51: “It is legal in the District of Columbia to pass on the left or on the right, but slow moving vehicles must stay in the right lane.”
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.
All District of Columbia permit topics
Where these come from
Every rule here is checked against DC Driver Manual, published by the District of Columbia Department of Motor Vehicles, and against the state code itself. Last checked 2026-10-05.
- src/assets/drivers-manuals/DC.pdf (DC Driver Manual (English), Rev. 7/29/2021, District of Columbia Department of Motor Vehicles, fetched 2026-10-05 from the Wayback Machine's original-bytes capture of dmv.dc.gov; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/DC.pages.txt (the plain pdftotext fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- https://dmv.dc.gov/publication/dc-dmv-automobile-driver-manual (read 2026-10-05; links only the 2023 Issuu flipbooks)
- https://issuu.com/dcdmv/docs/dc_dmv_driver_manual_english_revised_final (the current 2023 edition, read 2026-10-05 from its public page images to diff against the pinned edition; not pinnable)
- https://dmv.dc.gov/service/knowledge-tests (read 2026-10-05; states no count or mark for the knowledge test)
- https://dcregs.dc.gov/Common/DCMR/RuleList.aspx?ChapterNum=18-1 (18 DCMR chapter 1, sections 100-114, read 2026-10-05; section 104 sets what the examination covers and states no figure)
- https://code.dccouncil.gov/us/dc/council/code/sections/50-1401.01 (D.C. Code 50-1401.01, read 2026-10-05; requires a knowledge examination and states no figure)