Highways and merging — Pennsylvania Permit Test
Highways and merging on the Pennsylvania permit test — 7 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Where a highway entrance and exit share a short weaving lane, the driver entering the highway must yield to the driver who is exiting.
Two cars want the same piece of road at the same moment, so one rule has to settle it.
If you are the driver entering the highway, you must yield to the exiting driver.
To merge from an acceleration lane: signal and look for an opening, accelerate up to the speed of traffic, then merge into the opening.
Joining below the speed of traffic makes everybody behind you brake at once.
1. Put your turn signal on, and look for an opening in traffic. 2. Accelerate up to the speed of traffic. 3. Merge into the opening in traffic.
When leaving a highway, get into the exit lane well in advance and do not slow down until you have moved into it.
Braking in the through lane is what the driver behind you does not expect.
Get in the proper lane for exiting well in advance. Do not slow down until after you have moved into the exit lane.
If you miss your exit, take the next one; do not stop, back up, swerve across lanes or cross the median to turn around.
Every one of those puts you across a lane at full highway speed.
If you miss your exit, take the next one. Do not stop or back up on the highway.
Change one lane at a time when passing on a highway, and signal every time.
Crossing two lanes at once means checking two blind spots you can only check one at a time.
only change lanes one (1) lane at a time, use your turn signal every time you change lanes
Highway hypnosis happens when you stare straight ahead for a long time and stop scanning; drivers who zone out that way tend to crash into traffic slowing ahead of them.
You are still looking forward, but you have stopped seeing anything.
Another risk when driving on highways is inattention due to “highway hypnosis.” This happens when you stare straight ahead at the roadway for long periods of time, and stop actively scanning ahead, behind and around your vehicle.
If you must drive below 40 miles an hour on a limited access highway, use your hazard flashers to warn the drivers behind you.
Traffic arriving at 65 needs to be told early that you are not doing it.
If you must drive below 40 mph on a limited access highway, use your hazard (four-way) flashers to warn the drivers behind you.
On the test
Who yields in a weaving lane between an entrance and an exit?
The driver entering the highway. Two cars want the same piece of road at the same moment, so one rule has to settle it. PA Driver's Manual, p.52: “If you are the driver entering the highway, you must yield to the exiting driver.”
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 PA Driver's Manual, published by the Pennsylvania Department of Transportation, and against the state code itself. Last checked 2026-09-06.