Google has promised an Assistant driver mode for phones will arrive in mid-2019, but that is clearly not the case – more than a year has passed without any signs. It looks ready, though. XDA-Developers was discovered (by Android Police) that the Google Assistant driving mode is at least partially enabled for Android users. The interface has changed a lot from the 2019 I / O demo you see above, but the concept stays the same with large buttons and text that lets you chat, message and play music while maintaining your driving disorders to a minimum.
The rollout appears to be part of the server, and may be part of a test. It is not attached to any specific versions of Google Maps or in-app searches, and also works on different devices. Your access to your account may depend.