The problem is that it isn't limited to just speaking addresses. For example, here's something I experienced today:
(press voice button)
"Navigation"
(wait for it to switch to tomtom and then tomtom to prompt me)
"Drive to home"
(tomtom then prompts me to confirm I want to navigate to home)
"yes"
... oh, wait - safety lockout just engaged. So much for my navigation...
Here's the irony: While I can't use voice prompts to navigate to home, I can (while moving) tap the screen to navigate to a recent destination, scroll though that list, and select anything I've previously navigated to... and confirm it. All while staring at and tapping the screen... while moving.
Which is safer?
Anyway, the safety lockout impacting voice commands is/was apparently an oversight and is supposedly going to be corrected in the next tomtom firmware update. (Or so I've read on the tomtom forums...)
Take care
Gary