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Compared with a straight truck or bus, there are _______ things to inspect in combination vehicles.

There are more things to inspect on a combination vehicle than on a bus or straight truck. First, of course, there is the entire coupling system: the kingpin, the fifth wheel, etc. Next, there is the landing gear of each trailer. Finally, the air brake system is also more complicated than on a bus or straight truck, because compressed air must flow to all trailers so that both the tractor brakes and trailer brakes will work properly.