A 4 hour ride over the tops would probably offer less chance of spreading the virus than if you rode around the street you live in for 30 minutes.
Devil's advocate: it's still an incremental risk. You ride for 30minutes through the area to get out of it, then anyone you pass on the singletrack, or corner you lean into is an incremental risk of passing it on or ending up in A&E.
Weirdly my local 'loop' is out through the fields, farms, and villages and I've never seen the byways so busy with people walking. I commuted that way for years and saw almost no one. But the return leg I come back through a series of suburban parks/woods, greenbelt between industrial estates, the sort of paths where people actually normally walk their dogs for an hour and they're completely deserted!
Have to go out twice a day to feed and water the horses (about the only time I've been glad of the buggers!) and it's been great seeing so few cars and so many normal people out cycling. An amusing selection of old helmets clearly dragged from the depths of the shed and planked on peoples heads.
Quite a few serious roadies but definitely less than I would normally see. Despite that I still reckon I saw more people cycling than people driving today! Have had the local village people on Facebook complaining about the speed and even producing "articles" demonstrating that cyclists spread virus wider than walkers. Ignore and move on I'm afraid as will never change their minds.
