Speed limits heavy trucks and urban — Montana Permit Test
Speed limits heavy trucks and urban on the Montana permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Heavy trucks on Montana interstate highways have a speed limit of 65 mph, day and night.
A loaded truck needs far more road to stop than a car, so it is held to a lower speed.
Interstate Highways 75/80 75/80 65 65
On Montana's two-lane highways, the nighttime speed limit for heavy trucks is 55 mph.
A heavy truck at night on a narrow road has the longest stop of anything on it.
Two-Lane Highways 70 65 60 55
Interstates within the Billings, Great Falls and Missoula areas carry the urban limit of 65 mph for all vehicles, day and night.
City interstates have exits and merges close together, and cars cutting across lanes need slower traffic.
Urban Area Highways** 65 65 65 65
In Montana's speed table, heavy trucks are trucks in excess of a one-ton manufacturer's rated capacity.
A pickup driver who thinks the truck limits apply would hold up traffic for no reason.
Trucks in excess of one-ton Manufacturer’s Rated capacity.
On the test
What is the daytime interstate speed limit for heavy trucks?
65 mph. A loaded truck needs far more road to stop than a car, so it is held to a lower speed. Montana Driver Manual, p.38: “Interstate Highways 75/80 75/80 65 65”
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.
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- 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 Montana Driver Manual, published by the Montana Department of Justice, and against the state code itself. Last checked 2026-10-04.
- src/assets/drivers-manuals/MT.pdf (Montana Driver Manual, Revised April 2024, Montana Department of Justice, Motor Vehicle Division, retrieved 2026-09-14 and re-checked 2026-10-04; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/MT.pages.txt (scripts/mt-text.sh: pdftotext -layout except printed pp.24-26, which are plain; the fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/MT-exam.html (Administrative Rules of Montana 23.3.121, Road Signs and Road Rules, as reproduced by the Legal Information Institute, read 2026-10-04; states the seven-miss pass mark; sha256 pinned under examSource)
- https://mvdmt.gov/forms-driver-license/ (read 2026-10-04; links the manual)