Passing a truck — District of Columbia Permit Test
Passing a truck on the District of Columbia permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
When passing a truck, let the truck driver know you are passing by blinking your headlights, especially at night.
A trucker who knows you are coming can stay to the far side of the lane and will not drift into you.
Let the truck driver know you are passing by blinking your headlights, especially at night.
On a level highway, it takes only 3 to 5 seconds longer to pass a truck than a car.
Knowing the pass is only a few seconds longer helps you commit and finish it rather than hang alongside the truck.
On a level highway, it takes only three to five seconds longer to pass a truck than a car.
When passing a truck on a downgrade, the truck's momentum makes it go faster, so you may need to increase your speed.
Going downhill a heavy truck picks up speed on its own, and a pass planned at the old speed can leave you stuck beside it.
On a downgrade, the truck’s momentum will cause it to go faster, so you may need to increase your speed.
After passing a truck, move back only when you can see the front of the truck in your rear view mirror, then maintain your speed.
A car that cuts in close and then slows leaves the truck no room to stop, which is how many car-truck crashes happen.
Be sure to move back only when you can see the front of the truck in your rear view mirror.
If a truck driver blinks the lights after you pass, it may be a signal that it is clear to pull back in.
The trucker can see the space ahead of the cab better than you can, and the flash tells you the gap is there.
If the driver blinks the lights after you pass, it may be a signal that it is clear to pull back in.
On the test
How can you let a truck driver know you are passing?
Blink your headlights. A trucker who knows you are coming can stay to the far side of the lane and will not drift into you. DC Driver Manual, p.63: “Let the truck driver know you are passing by blinking your headlights, especially at night.”
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)