H. Any vehicle used to transport hazardous materials in placardable amounts.
N. A tank vehicle designed to transport any liquid or gaseous material with designed capacity of 1,000 gallons or more.
P. Any vehicles, public or private, designed to transport 16 or more passengers, including the driver
S. A commercial motor vehicle (requires CDL) used to transport pre-primary, primary, or secondary school students from home to school, from school to home, or to and from school-sponsored events. Does not include a bus used as a common carrier.
T. Combination vehicles with double/triple trailers
X. Any tank vehicle used to transport placardable amounts of hazardous materials

?383.93 Endorsements.

(b)(3) Tank vehicles;

?383.5 Definitions.

Tank vehicle means any commercial motor vehicle that is designed to transport any liquid or gaseous materials within a tank that is either permanently or temporarily attached to the vehicle or the chassis. Such vehicles include, but are not limited to, cargo tanks and portable tanks, as defined in Part 171 of this title. However, this definition does not include portable tanks having a rated capacity under 1,000 gallons.

?171.8 Definitions and abbreviations.

Bulk packaging means a packaging, other than a vessel or a barge, including a transport vehicle or freight container, in which hazardous materials are loaded with no intermediate form of containment and which has:

(1) A maximum capacity greater than 450 L (119 gallons) as a receptacle for a liquid;

(2) A maximum net mass greater than 400 kg (882 pounds) and a maximum capacity greater than 450 L (119 gallons) as a receptacle for a solid; or

(3) A water capacity greater than 454 kg (1000 pounds) as a receptacle for a gas as defined in ? 173.115 of this subchapter.

Cargo tank means a bulk packaging that:

(1) Is a tank intended primarily for the carriage of liquids or gases and includes appurtenances, reinforcements, fittings, and closures (for the definition of a tank, see 49 CFR 178.320 , 178.337-1 , or 178.338-1 , as applicable);

(2) Is permanently attached to or forms a part of a motor vehicle, or is not permanently attached to a motor vehicle but which, by reason of its size, construction or attachment to a motor vehicle is loaded or unloaded without being removed from the motor vehicle; and

(3) Is not fabricated under a specification for cylinders, intermediate bulk containers, multi-unit tank car tanks, portable tanks, or tank cars.

Cargo tank motor vehicle means a motor vehicle with one or more cargo tanks permanently attached to or forming an integral part of the motor vehicle.

Portable tank means a bulk packaging (except a cylinder having a water capacity of 1000 pounds or less) designed primarily to be loaded onto, or on, or temporarily attached to a transport vehicle or ship and equipped with skids, mountings, or accessories to facilitate handling of the tank by mechanical means. It does not include a cargo tank, tank car, multi-unit tank car tank, or trailer carrying 3AX, 3AAX, or 3T cylinders.

A person with a CDL/A license cannot drive a bus with passengers unless they pass a written test. Driving test also unless they have a CDL/A already.

?383.91 Commercial motor vehicle groups.

(a) Vehicle group descriptions. Each driver applicant must possess and be tested on his/her knowledge and skills, described in subpart G of this part, for the commercial motor vehicle group(s) for which he/she desires a CDL. The commercial motor vehicle groups are as follows:

(a)(1) Combination vehicle (Group A) ? Any combination of vehicles with a gross combination weight rating (GCWR) of 11,794 kilograms or more (26,001 pounds or more) provided the GVWR of the vehicle(s) being towed is in excess of 4,536 kilograms (10,000 pounds).

(a)(2) Heavy Straight Vehicle (Group B) ? Any single vehicle with a GVWR of 11,794 kilograms or more (26,001 pounds or more), or any such vehicle towing a vehicle not in excess of 4,536 kilograms (10,000 pounds) GVWR.

(a)(3) Small Vehicle (Group C) ? Any single vehicle, or combination of vehicles, that meets neither the definition of Group A nor that of Group B as contained in this section, but that either is designed to transport 16 or more passengers including the driver, or is used in the transportation of materials found to be hazardous for the purposes of the Hazardous Materials Transportation Act and which require the motor vehicle to be placarded under the Hazardous Materials Regulations (49 CFR part 172, subpart F).

I'm surprised that IN and IL don't have "M" endorsements with all the metal coils that I've seen dumped alongside the hiway in Gary and Chicago. Sometimes they get to looking like some kind of flexible air-duct a half mile long.

Rev.Vassago
H. Any vehicle used to transport hazardous materials in placardable amounts.
N. A tank vehicle designed to transport any liquid or gaseous material with designed capacity of 1,000 gallons or more.
P. Any vehicles, public or private, designed to transport 16 or more passengers, including the driver
S. A commercial motor vehicle (requires CDL) used to transport pre-primary, primary, or secondary school students from home to school, from school to home, or to and from school-sponsored events. Does not include a bus used as a common carrier.
T. Combination vehicles with double/triple trailers
X. Any tank vehicle used to transport placardable amounts of hazardous materials

IOW, if I get a CDL class A, I understand air brakes is included (because one cannot get class A without it).

S. A commercial motor vehicle (requires CDL) used to transport pre-primary, primary, or secondary school students from home to school, from school to home, or to and from school-sponsored events. Does not include a bus used as a common carrier.

P. Any vehicles, public or private, designed to transport 16 or more passengers, including the driver

So,if for some unknown reason I ever decide to haul fuel,etc,would I need the N and X or just the X? I assume that the N is non-hazmat tanker,and the X is hazmat tanker? If ya haul water or any other non-hazmat tanker,and ya start hauling fuel,you have to get the X? Would the X work for the non-hazmat as well as the hazmat? I wouldnt wanna be a rollin refinery,but I was just curious..