What we could do with is a quick ‘fix’ that the drivers know about when the brakes lock on in a ‘live lane’ to shift it to the hard shoulder or a few yards out of the way.
The way it is if you can’t shift it if it’s a big un, your gonna get ‘rimmed’ a minimum £4500k bill to shift it for you as it will probably be classed as substantially damaged as the wheels won’t turn 
Below is some info i got from someone on Trucknet nearly 6 years ago stored away to try and shift those trucks that were jacknifed/down on air, i’m not going to comment on if it works or not 
from when i used to give a toss:
did my 30 years in “The Job” which included a few years on the Mid-Links, mainly before Spring Brakes became the norm, which made it a lot easier, and sort of fell into driving as a means of supplementing my pension.
A ‘potted version’ as to how brakes work, without teaching a grandmother…, hopefully.
The Red Line supplies air to the trailer tank and keeps it up to pressure.
The Yellow Line carries the signal from the Foot Control Valve to the RE6 valve (on the trailer) which determines how much air is passed from the trailer air tank to the brake actuators.
If any of these levels fall below about 6 bar, then the brakes are automatically applied.
The majority of jack-knifes result in, or are caused by, a failure of the Red Line.
The Unit is unable to continue forward, because the brakes have become ‘applied’, but the momentum of the trailer is still pushing forward.
So. You arrive at the scene. The Red Line is either fractured or punctured. The first priority is to negate any reduction of the residual pressure in the trailer tank.
Disconnect the Yellow Line, as a driver who is buggering about with the brake pedal or the parking brake, will be reducing that residual pressure.
Your next best friend is/are Cable Ties. By disconnecting the Yellow Line, you;ve isolated any further pressure loss from the trailer reservoir. But what you now need to do is establish a working pressure in the unit.
If the Red Line has ‘failed’ then it is simply a matter of ‘kinking’ the Red Line back on itself and securing with a cable tie. This then allows pressure to build up within the Unit. Once 6 bar+ has been obtained, push in the ‘Shunt’ button on the trailer, the black one, and it should move. Although I wouldn’t recommend anyone driving it at much more than walking pace.
If the Red Line has sheared off next to the Unit, then consider a cloth bung, something out of the First Aid kit, and a scrap of wood, held in place by a couple of cable ties, and then stand well clear whilst it is established if pressure builds up.
The main thing to remember is that it is not a ‘multiple choice’ exercise. You have a ‘Finite’ resource, Air. And if the means of getting that Air from the Unit to the trailer has been severed, then you are restricted as to how many attempts you have to move that trailer .
After being bollocked on numerous occasions by ‘management’, if i wasn’t sat in the office now i would now leave it and cone othe ■■■■■■ out and let the queues build up until recovery shifted it an hour or 2 later 