Crazy amount of road closures across the UK, what's happening?!

I've just been on Google maps for the UK and noticed most of the cities, mainly England have major road closers.
I then searched Google news and most cities and towns seem to be having major road closures for the next two weeks. 1 day of road closers is usually enough to cause major traffic jams, imagine 2 whole weeks around most major cities?

Blocking People in? Studying traffic flow for future 4th industrial revolution plans? Causing chaos for 'climate crisis' illusion of too many cars on the road?