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Generally all truck drivers that want to get the commercial driver license go through the general knowledge test. After the general knowledge test each driver should decide what kind of truck he would like to drive in order to know which tests and which licenses he will need.
If a truck driver wants to drive a vehicle that has air brakes , for sure he will have to go through the air brakes test. Therefore this test includes air brakes and air over hydraulic brakes.
Source: www.localtrucks.com
Since there is high demand of truck drivers for combination vehicles, there are a lot of truckers that go through the combination vehicles test.
Source: www.transportationfortomorrow.com
Furthermore, if you want to haul hazardous materials then you will have to pass another test- the hazardous materials test. Similarly if you are planing to haul any liquid or gaseous materials in a tank you will have to take the tank vehicle test.
Source: www.fox5sandiego.com
When it comes to the doubles and triples test , it is made only for truck drivers that want to pull double or triple trailers.