Try this
- State the setting boundary before the discussion expands. Driving, navigation and the ability to pause are practical reasons to choose another moment.
- Offer a later place or leave the timing open if you cannot yet propose one.
A worked example
“I don’t want to have this discussion while either of us is driving.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Choose a later setting rather than continuing through short questions at traffic lights.