I frequently see people walking off of the sidewalk for a few seconds to maintain social distancing. They don't seem to have any issue doing this, as there is usually enough space between sidewalk and car lanes to not have to walk into traffic.

edit - If you need to take a walk through downtown Los Angeles or somewhere where it is physically impossible to social distance, then yes wear a mask.

The sidewalks here in the UK are often so narrow your can only just fit two abreast. We seem to have quietly understood the need for one to step into the road to pass, these days. I am not sure I can even recall someone walking past me in close proximity.

Yeah? You think pedestrians should step right out around a line of parked cars into traffic on Flower St. in downtown Los Angeles?

Weirdly specific. What do you suggest?

I suggest everyone wear a mask when out on the street.