Following distance — Massachusetts Permit Test
Following distance on the Massachusetts permit test — 7 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Use the three-second rule to keep a safe distance from the vehicle in front of you.
Counting is easier than judging feet at speed, and it scales by itself: the faster you go, the more road three seconds buys.
Use the “three-second” rule to keep a safe distance from the vehicle in front of you.
Pick an object ahead, and if you reach it before counting three after the vehicle in front passes it, you are too close.
The object does the measuring for you. Whatever the speed, the count is the same.
When the vehicle in front of you reaches that object, count out “one one-thousand, two one-thousand, three one-thousand”.
Keep at least four seconds behind a motorcycle, more than you would leave for another vehicle.
A motorcycle stops shorter than a car and can go down in front of you. The extra second is the room to not run over it.
Keep more space (at least four seconds) behind a motorcycle than you would for another vehicle.
Keep at least ten seconds between your vehicle and heavy equipment such as dump trucks and tractors.
Heavy equipment throws stones and stops in its own time. Ten seconds is the gap where neither of those reaches you.
Keep more space (at least ten seconds) between your vehicle and heavy equipment (for example, dump trucks, tractors).
Tailgating is illegal and is the main cause of rear-end crashes, and the fine can be as high as $100.
Following close does not make the car in front go faster. It only removes the room you would need when it stops.
The fine for tailgating can be as high as $100.
If a tailgater is behind you, move to another lane or pull to the side of the road and let them pass.
You cannot control the gap behind you, only whether you are still in front of it. Braking to make a point makes the crash likelier.
If a tailgater is behind you, move to another lane or pull to the side of the road to let the tailgater pass.
The three-second rule is a minimum for good road conditions and moderate traffic, and you should count more when traffic allows.
Three seconds assumes dry road, good light and a car that stops normally. Take any of those away and three is not enough.
The three-second rule is a minimum safe distance for good road conditions and moderate traffic.
On the test
What rule sets a safe distance from the vehicle in front?
The three-second rule. Counting is easier than judging feet at speed, and it scales by itself: the faster you go, the more road three seconds buys. Massachusetts Driver's Manual, p.43: “Use the “three-second” rule to keep a safe distance from the vehicle in front of you.”
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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Where these come from
Every rule here is checked against Massachusetts Driver's Manual, published by the Massachusetts Registry of Motor Vehicles, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/MA.pdf (Massachusetts Driver's Manual, Revised April 2026, Massachusetts Registry of Motor Vehicles, retrieved 2026-09-14 from mass.gov)
- src/assets/drivers-manuals/MA.pages.txt (pdftotext -layout over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 8, folioMarker, nonLawPages, signGalleryPages and the extraction flag, each with its measured basis)