Does a HGV Class driver get taught about 'jacknifing' and performing a 'controlled jacknife' if he MUST stop?

i know that a HGV driver should never jacknife but in rare circumstances if he has to brake and stop fast he should perform a controlled jacknife.


this answers my second question 'a controlled jacknife will stop a truck faster then pumping the brakes and slowing'





technology is different now i know so it applies to ever being the case.





thanksDoes a HGV Class driver get taught about 'jacknifing' and performing a 'controlled jacknife' if he MUST stop?
There is no such thing as a controlled jacknife. In fact, a jacknife is the one thing in this world that shows a total loss of control.





I was taught in 1976 that it only takes 1/5 of a second for a rolling rig to go into a full jacknife, and if that happens the only thing you can do is kick it out of gear and hold on.





As far as pumping the brakes, that will bleed off your air supply and when that happens it will lock up your brakes. Then you're in a world of trouble.





Modern trucks are equipped with ABS. If you hit the brakes and the pedal starts to pulse and the truck makes noises that sound like ';psst psst psst'; the ABS is working to keep your wheels from locking up. Don't pump your brakes.





Of course, if you're already in that type of situation, you're already driving slow enough that you don't have anything to worry about.Does a HGV Class driver get taught about 'jacknifing' and performing a 'controlled jacknife' if he MUST stop?
Whoever told you, you can perform a controlled jackknife is full of crap. The only controlled jackknife is when you jackknife the truck into a dock or parking spot.





A jackknifing tractor/trailer is about the most out of control situation you can ever be in, in a truck. There is absolutely NOTHING you can do to control or correct the situation. You will have drivers tell you that you can gas on it or use the trolley valve to pull it out of a jackknife, but I can guarantee you, they have never been in the situation and they don't know what they are talking about. When a tractor trailer starts jackknifing, from the time it starts, to the time it's all over with is split seconds. It isn't enough time for you to comprehend what is happening and react to it. Even if there was anything you could do, there is no time to do it.
No because they are thought to not get into that situation, however being in that situation before, it's all about perception %26amp; what is called brake lag. Perception is the time for the mind to see a problem %26amp; tell the leg to step on the brakes. Brake lag is the time for the leg to apply the brakes till the brakes actually engage. No matter what anyone says, there's no such thing as a ';controlled jackknife'; because every situation is different.

lip plumper