[StavrosK]

Yeah, Google's voice recognition has worked for me everywhere, even loud clubs. It's quite magical. I'm sure it would work in the car.

Now, whether I would trust Google with that data is a different question. (Spoiler: no.)

[jstandard]

Inside the car is a bit of a different since the device won't be handheld and you may not even be directing your voice toward the microphone.

If you have a phone with a high-quality mic, mount it in the right spot, and speak loudly, it can usually get the job done though.

Performance in general has gotten a lot better in recent years, though it's tough to call it a "solved problem".