Truck no zones — District of Columbia Permit Test
Truck no zones on the District of Columbia permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.
The rules
A truck's blind spots reach up to 20 feet in front of the cab, along either side, and up to 200 feet behind it.
A car sitting in any of those spaces is invisible to the trucker, who may change lanes or brake right into it.
If you’re following a truck, stay out of its “blind spots”, up to 20 feet in front of the cab, on either side of the tractor-trailer, particularly along the sides of the cab, and up to 200 feet in the rear.
A truck's front blind spot reaches up to 20 feet in front of the cab.
The trucker sits high and cannot see the hood of a small car tucked just ahead of the bumper.
If you’re following a truck, stay out of its “blind spots”, up to 20 feet in front of the cab, on either side of the tractor-trailer, particularly along the sides of the cab, and up to 200 feet in the rear.
If you cannot see a truck driver's face in the side-view mirror, the driver cannot see you.
The mirror works both ways, so it is a quick test of whether the trucker knows you are there before they change lanes.
If you cannot see the drivers face on the side-view mirror, he or she cannot see you.
Avoid tailgating a truck or bus: they have huge no-zones directly behind them where the driver cannot see your car.
If the truck brakes hard you are hidden behind it with nowhere to go.
The truck or bus driver cannot see your car back there.
Truck and bus drivers need nearly twice the time and room to stop as cars, so do not cut in front too soon after passing one.
A car that pulls in close in front of a truck uses up the space the truck needs to stop.
Truck and bus drivers need nearly twice the time and room to stop as cars.
Never cross behind a truck that is backing up; truck drivers do not have a rear view mirror and may not see you.
With no mirror looking straight back, a trucker reversing has no way to see a car that slips in behind.
Never cross behind a truck that is backing up.
On the test
How far behind a truck can its rear blind spot reach?
Up to 200 feet. A car sitting in any of those spaces is invisible to the trucker, who may change lanes or brake right into it. DC Driver Manual, p.64: “If you’re following a truck, stay out of its “blind spots”, up to 20 feet in front of the cab, on either side of the tractor-trailer, particularly along the sides of the cab, and up to 200 feet in the rear.”
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
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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)