High and low beams — Connecticut Permit Test
High and low beams on the Connecticut permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Use your high beams whenever there are no oncoming vehicles, because high beams let you see twice as far as low beams.
Twice the sight distance is twice the time to react, and on an unlit road that is the whole of your margin.
High beams let you see twice as far as low beams.
Dim your high beams whenever you come within about a one-block distance of an oncoming vehicle.
A blinded oncoming driver cannot see the road, and they are the one closing on you at combined speed.
Dim your high beams whenever you come within about a one-block distance of an oncoming vehicle.
Use your low beams when following another vehicle or when in heavy traffic.
High beams fill the mirrors of the car ahead, which blinds the driver you are following.
Use your low beams when following another vehicle or when in heavy traffic.
Use low beams in fog or when it is snowing or raining hard, because light from high beams reflects back and causes glare.
High beams light up the fog itself, so more light makes you see less rather than more.
Use the low beams in fog or when it is snowing or raining hard.
High beam headlights let you see about 400 feet ahead, so you should drive at a speed that lets you stop within that distance, about 50 mph.
It ties the light to a number: the beam reaches 400 feet and 400 feet is a stop from fifty.
Your high beam headlights will let you see about 400 feet ahead.
If a vehicle comes toward you with high beams on, flash your headlights quickly a couple of times, and if the driver does not dim them, look toward the right side of the road.
Looking right keeps the edge line in view and keeps their lights out of your eyes until they pass.
If the driver fails to dim the lights, look toward the right side of the road.
On the test
How much further do high beams let a driver see than low beams?
Twice as far. Twice the sight distance is twice the time to react, and on an unlit road that is the whole of your margin. Connecticut Driver's Manual, p.38: “High beams let you see twice as far as low beams.”
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 Connecticut Driver's Manual, published by the Connecticut Department of Motor Vehicles, and against the state code itself. Last checked 2026-09-16.
- src/assets/drivers-manuals/CT.pdf (Connecticut Driver's Manual, Revised March 2023, retrieved 2026-09-14)
- src/assets/drivers-manuals/CT.pages.txt (plain pdftotext over that PDF; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/SOURCES.json (sha256, folio offset 2, folioMarker, nonLawPages and the extraction flag, each with its measured basis)