There are so many face masks worn with nose out and constant fiddling.
I think short journeys on public transport where your standing or sitting for short communtes - it's not a bad idea.
We often do long journeys by train.
I don't think were going to be able to go on our holdiay as we in Wales so locked down - but mainly as we'd be easy to spot as we have to travle by train across the welsh border. It would be about three hours on the train - and usually we'd have option of eating drinking now it would be trying to stop mask fiddling.
When they were younger we lived else where and holiday journeys just train part were 6 hours - it get to get to our parents it's 4-5 hours.
Two of us are asthmatic and I don't know how long we'll be able to tolerate masks and while I know there are exceptions for medical conditions - people can be arseholes and I'm not sure brandishing our inhailors would be enough to avoid confrontations.