[ptrenko]

I think thats an efficient way of testing if a country is actually improving its situations and getting out of the lockdown. Even traffic data could be useful.

If pollution is still low, the country is not actually back to work yet

[prennert]

The financial times is printing regularly graphs of traffic per day in different cities. If they do it, I am sure sophisticated fonds and investors are doing this on a bigger scale to understand how well the economies are recovering.