Traffic calming — New Jersey Permit Test
Traffic calming on the New Jersey permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Pavement markings, signs and crossbucks are passive warning devices; flashing lights, ringing bells and lowered gates are active ones.
A passive device says a crossing is there. An active one says a train is coming now.
Pavement markings, signs, and crossbucks are passive warning devices; flashing red lights, ringing bells, and lowered gates are active warning signs.
A slow-moving vehicle sign marks farm and construction equipment operating on public highways.
The machine ahead may be doing 15 mph. Closing on it at highway speed happens fast.
orange triangular sign indicates slow-moving vehicles, such as farm and construction equipment operating on public highways.
Rumble strips alert a driver that a decision point is ahead, such as an intersection after a long stretch of open road.
They vibrate the wheel and make a noise, which wakes a driver who has stopped paying attention.
raised strips on the highway or shoulder that are put there to alert the motorist that there is a decision point ahead
A speed bump is a low ridge across a street built to slow cars down.
It works on the driver rather than the road: nobody takes it fast twice.
A speed bump is a low ridge that runs across a street and that is designated to slow down cars.
A roundabout is a one-way circular intersection where traffic flows around a center island.
Everything enters and leaves by a right turn, which takes the head-on and the left turn out of it.
A roundabout is a one-way, circular intersection in which traffic flows around a center island.
On the test
Which railroad warning devices are the active ones?
Flashing lights, bells and gates. A passive device says a crossing is there. An active one says a train is coming now. New Jersey Driver Manual, p.217: “Pavement markings, signs, and crossbucks are passive warning devices; flashing red lights, ringing bells, and lowered gates are active warning signs.”
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 New Jersey Driver Manual, published by the New Jersey Motor Vehicle Commission, and against the state code itself. Last checked 2026-09-15.