Question About The Online CDL Training Program - Specialized Exams "Combination Vehicle"

(The concepts are simple, but I don't want to get tripped up on the wording, so looking for clarification on this.)

In "Driver's License Classifications - Page 2"...

Part 1.5 says a Class A CDL is for "Combination vehicles - GCWR* of 26,001 or more ..."

Part 1.6 lists seven special endorsements and one restriction that require testing:

C - Charter Bus X - Combination Tank and Hazardous T - Double/Triple Trailers P - Passenger S - School Bus N - Tank H - Hazardous L-Restriction - Air Brakes

But in part 1.7, it lists the optional specialized exams as only: air brakes, combination vehicle , double/triple, hazardous, passenger, school bus, tanker. Charter Bus isn't listed ... I assumed it was just left off as the list wasn't meant to be complete. I also assumed that "combination vehicle" meant the "Combination Tank and Hazardous" special endorsement previously listed in Part 1.6 and not the general "Combination Vehicle" term as used in Part 1.5 for a Class A license.

But then I got confused when the quiz gave this question: "Which written exams must be taken in order to drive a single-trailer combination vehicle exceeding 26,001 pounds equipped with air brakes?" with the correct answer being "General Knowledge, Air Brakes, Combination Vehicles".

So do we assume anytime "combination" is used in a test that it means "combination tank and hazardous"? Or is it that "single-trailer" already implies the CDL Class A description "combination vehicle" so the further use of "combination" after it can only be referring to "combination tank and hazardous" otherwise it would be redundant?

If "combination vehicle" is used on the actual CDL test, do I assumed it means the "combination tank and hazardous" or just a normal tractor-trailer combo?

I am studying the PA manual and the High road program also. GCWR is the gross combined weight rating. This is a general term referring to the tractor(truck) and what ever it is towing(trailer). Not a specific endorsement like a tanker/hazmat

Check your definitions:

Combination Vehicle : A combination vehicle is two or more vehicles put together, like a tractor (technical term for the power unit) and a trailer. Yes, a trailer is a vehicle. This definition has nothing to do with hazardous material.

Bus: The P endorsement is needed to operate any vehicle that seats 16 or more people, including the driver. The difference between a "regular" bus and a School Bus is that a school bus carries our babies so you need that "S" endorsement as well.