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Several key sectors in the great state of Pennsylvania can offer economic opportunities to drivers of combination vehicles (such as semi-trucks and tractor-trailers). Pennsylvania’s agricultural sector produces mushrooms, apples, poultry, and many other agricultural products. Much of this is exported from the state by truck. The state’s five manufacturing centers need truck drivers to transport materials to the manufacturers and transport their finished products. Pennsylvania’s proximity to New York, New Jersey, and Washington, DC have helped make the state (especially the Lehigh Valley) a major logistics hub, creating a demand for long-haul truck drivers. Finally, the Port of Philadelphia, one of the fastest-growing ports and the largest refrigerated port in the country, needs truckers skilled in intermodal transportation and the transportation of refrigerated products.
Major truck routes in Pennsylvania include Interstates 76 (the Pennsylvania Turnpike), 78, 80, 81, and 95; U.S. Routes 22 and 30; and State Route 283.
To have a career driving heavy combination vehicles such as semi-trucks and tractor-trailers, you may have a long road ahead of you (pun intended). To drive commercial motor vehicles (CMVs), you must meet all the requirements to obtain a Commercial Learner’s Permit (CLP) and then a Commercial Driver’s License (CDL) of the appropriate class (likely Class A for heavy combination vehicles). But to be allowed to drive heavy combination vehicles specifically, you must also pass the official Combination Vehicles knowledge test on the theory of operating combination vehicles.
M.S., Chief Educational Researcher (ACES member)
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Like the other official CDL knowledge tests, the Combination Vehicles knowledge test is based on the official Pennsylvania Commercial Driver’s Manual (Pennsylvania CDL Handbook 2026). Therefore, you should read this study guide (especially Chapter 6) as part of your study plan. And we have some additional tools for you that will really help you ace this knowledge test.
This free Pennsylvania CDL Combination practice test is based on the official Pennsylvania Commercial Driver’s Manual, just like the official knowledge test. It’s up to date as of January 2026. There are 25 multiple-choice questions and answers on such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and pre-trip inspections. Unlike the official knowledge test, however, each question on this practice test comes with an available hint, courtesy of our automated assistant; use it if you get stuck. Each question also comes with an explanation of the correct answer. Read it carefully if you missed the question so you won’t make the same mistake again. What this practice test doesn’t have is a time limit. Take your time and learn as much as you can from the practice test. If you miss a question, study the relevant sections of the CDL manual.
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