There has been a huge debate about what one can do on a Prius in the very unlikely event that the accelerator pedal gets stuck or receives a wrong command from the computer (a lot more hereToyota's runaway car worries may not stop...). So I tested what happens when "N" mode is selected. First of all, the fastest way to insert N mode, is to press the P button or set reverse "R" mode. If you shift the lever too quickly in N and don't keep it there for a few seconds, it will *not* shift into N. And I think there is a good reason not to shift immediately in N at speed when selecting it with the lever: when in N, not only the engine "idles" or whatever it does to simulate neutral, but the accelerator does not work anymore - try it - nothing happens, no revving, nothing. So if you are, say, overtaking or in an emergency when you need acceleration and accidentally N is selected immediately, something could happen due to complete loss of power to the wheels. This should not happen. BTW: N is simulated, you read right: there is no clutch or hydraulic transmission/clutch in a Prius - the wheels are permanently connected to the drivetrain via the electric motor and the planetary gear system, called also Power Split Device (PSD). Which means, unless someone knows otherwise, if the computer has decided that you cannot switch into N, you're out of luck. The same goes with the on/off switch. If the computer decides that after 3 secs of pressing the switch when at speed, you are not turning off the engine, you are *not* turning it off. There is no mechanical way to turn the car off..... I have also noticed that the brake pedal does not negate the accelerator pedal signal: the accelerator does get disconnected instead as mentioned when you are in N. Why?!?!? what is the reason to accelerate and brake at the same time on this car? Try pressing the brake and accelerator pedal with standing - the engine at the beginning is quiet, then the ICE kicks in and the only thing it can do is re-charge the battery....but as soon as you leave the brakes the car move (abruptly) forward. Try it somewhere safe with nobody around!!! The same happens when driving at speed - if you press the accelerator full throttle while braking, the accelerator command will not be negated. There is a *but*, though - because the engine is not *directly* connected to the wheels, rather it exchanges torque with the generator and the motor, when both gas and brake pedal are pressed, the motor will be forced to slow down, so the only way for the engine to give torque to "something" is via the generator to create electricity to charge the batteries - this is the only thing that I can imagine myself as close as to the buffering effect of the clutch in a normal car. I never understood one thing though - when the battery is completely charged, what happens if the ICE is forced to continue to run (stuck accelerator pedal, going downhill, etc?) - is the generator disconnected? what happens at the connection? what voltage will be built up and how does the rotational energy of the generator get dissipated? Also - why does the Prius need to crawl when in D since there is no clutch or hydraulic connection to the PSD? why does the car simply stand still in D if no gas is given? why does it have to behave like a '70s automatic gearshift car????