Interstate driving — Maryland Permit Test
Interstate driving on the Maryland permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.
The rules
A limited access highway is a large road with no intersections or traffic lights and a limited number of places to enter and exit. An interstate is one that crosses from one state to another.
No intersections means nothing crossing your path, which is why the speeds are what they are.
You use the acceleration lane to adjust your speed to the flow of traffic already on the highway, and you should not cross the solid lines that divide the entrance from the highway.
Joining below the speed of traffic makes everybody behind you brake at once.
If you are driving slower than the traffic on the highway, you must drive in the right lane whenever possible.
A slow car in the through lane makes everybody else change lanes around it.
Move to the right lane well before your exit and start slowing as soon as you enter the deceleration lane, continuing to slow to the posted limit for the exit ramp.
Braking in the through lane is what the driver behind you does not expect.
If you exit at the wrong place, continue until you are off the exit ramp and then look for a way to re-enter the road. Never stop and back up on any part of the highway.
A car reversing on a highway is the one thing nobody behind you is looking for.
You may stop on the shoulder only when your vehicle is disabled or you have another emergency. Turn on your emergency flashers and stay inside your vehicle if you can.
It is very dangerous to stand or walk beside a highway, because the traffic is moving very fast.
On the test
What is a limited access highway?
A road with no intersections or lights. No intersections means nothing crossing your path, which is why the speeds are what they are.
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.
Where these come from
Every rule here is checked against Maryland Driver's Manual, published by the Maryland Department of Transportation Motor Vehicle Administration, and against the state code itself. Last checked 2026-09-06.