Double Triple Test | Pennsylvania 2025 #1 Page 3 of 3
Train for FREE with our Pennsylvania CDL double triple practice test online. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a PA CDL double triple license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements may vary from state to state.
15 . In a double or triple combination:
In a double or triple, the more heavily-loaded trailer should be immediately behind the tractor.
16 . Which part of a combination vehicle is the most likely to turn over?
The "crack-the-whip" effect makes the last trailer in a combination the most likely to turn over. Be especially careful when operating a double or triple combination vehicle around a turn or corner.
17 . What happens when you push in the trailer air supply control knob?
To send air to the emergency (supply) lines, a driver can push in the trailer air supply control knob. The knob is red and eight-sided.
18 . What happens if, after connecting a trailer, there is no air pressure in the trailer brakes?
After coupling trailers, be sure to check the air brakes. If air does not flow all the way to the back each brake line, the brakes will not work.
19 . Due to the "crack-the-whip" effect:
Double and triple trailer combinations are more likely to turn over due to the "crack-the-whip" effect than are other combination vehicles. Drivers should be aware of the rearward amplification of their specific vehicles and steer accordingly.
20 . When driving a double or triple, it is important to remember that:
Doubles and triples need more space than other vehicles, both because they are longer than other vehicles and because their size and weight prevent them from turning or stopping suddenly. When driving a double or triple, always make sure you have enough space before entering traffic, crossing traffic, or changing lanes.
See the exact questions that will be on the 2025 Pennsylvania DMV exam.
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