I have a 2010 Prius, and according to the manual, this is precisely what happens if you push the power button while moving.
Of course, if the computer is busted, I'm assuming the long button press will be sent to /dev/null.
That is what sucks about cars with power steering, they don't get any of the benefit a car built with no power steering does.
Getting that boat of a minivan around the next corner in traffic was both entertaining, dangerous, and probably the best upper-body workout I got that year.