General speed restriction — District of Columbia Permit Test
General speed restriction on the District of Columbia permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
District traffic laws provide both a general speed restriction and specific speed limits, and you must obey both: no one should drive faster than is reasonable under existing conditions.
A posted limit is set for good weather, so going that fast in rain or a crowd can still be too fast.
District of Columbia traffic laws provide both a general speed restriction and specific speed limits.
No one should drive at such a slow speed that they impede the normal and reasonable movement of traffic, except when a reduced speed is needed for safety or by law.
A car crawling along makes others tailgate and pass on impulse, which causes crashes of its own.
No one should drive at such a slow speed they impede the normal and reasonable movement of traffic except when a reduced speed is necessary for the safe operation of the vehicle or in compliance with the law.
Never exceed the posted speed limit; up to the limit, it is safest to drive at the average speed at which traffic is moving.
The more you go faster or slower than the cars around you, the more often you meet them, and the greater your chance of a crash.
Up to the limit, it is safest to drive at the average speed at which traffic is moving.
The impact speed in a head-on collision is the sum of the speeds of both vehicles: two vehicles each going 50 miles per hour hit at 100 miles per hour.
Two cars meeting head-on take the force of both speeds at once, which is why head-on crashes are so deadly.
The impact speed in a head-on collision is the sum of the speed of both vehicles.
On the test
Which speed rules must you obey in the District?
Both the general rule and posted limits. A posted limit is set for good weather, so going that fast in rain or a crowd can still be too fast. DC Driver Manual, p.79: “District of Columbia traffic laws provide both a general speed restriction and specific speed limits.”
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)