Then you better contact them and have them make it sign-commanded before it comes out.
But then again, I don't know if I would want a voice-commanded (or sign-commanded) vehicle. I can imagine having an accident in the car while communicating with my friends.
Friend: Hey, that was a fun party!
Me: Yeah, it was! I really enjoyed it!
Friend: Hahaha... I really enjoyed the poking part. We were all poking each other all night long. It made me feel ticklish!
Me: Hehehe! Me too! I was never that ticklish!
Friend: *pokes me* Hmm... still ticklish?
Me: Hahaha... not really.
Friend: *pokes me repeatedly* Ticklish yet? Hehehe!
Me: Okay, I'm starting to get ticklish... stop. Hahaha! *giggling*
Friend: *pokes me harder and faster* Hahaha... this is fun!
Me: Stop!
*car stops*
*car behind me hits me*
*car behind car behind me hits car behind me*
I can see the headlines of the newspaper. "DEAF DRIVER ABRUPTLY STOPS CAR ON INTERSTATE CAUSING A 10-CAR PILE-UP"