Power steering and power brakes work just fine when the engine is turned off. They are just harder to turn or apply.
(a)The driver runs the risk of locking the steering wheel.
(b)The brakes will be MUCH harder to operate, especially with ABS.
Follow the dispatcher's instructions. Put the vehicle in Neutral and try for the shoulder as the vehicle coasts. Toyota has plenty of engines in the back room, and this whole thing is definitely on them.
Stayed tuned for the klown-boy's lawsuit, which, like so many colleagues on this thread, I suspect this is all about.
Then they're no longer "power" steering or "power" brakes. Even on a small car, you get about 20 seconds or three to four episodes of braking, then it's your leg vs the machine.