Aye
Re: Cars it also makes sense to me. The aim is to limit transmission between people and masks in cars are a good way.
In theory masks even at home would be even more effective but that is impossible to control or enforce obviously
It's probably unrealistic to try and prevent spread within a household. If it gets really bad maybe we could have some non-binding recommendations in that area, I think Deborah Birx said something about that. However what we should focus on now that cases and deaths are low is limiting spread between households, so our suppression strategy can succeed.