What are you even talking about?
VAT has existed in France for decades. The 20% tax has nothing to do with cars, its just the regular VAT you pay on any transformed good. People driving old cars also paid VAT when they bought it (it might have been closer to 17% back in the time).
And finally the yellow vest movement has nothing to do with VAT.
Pretty sure you are missing something. We are talking about Costa Rica, not France. There have been protests in Costa Rica about a new tax. Truckers have been clogging up the roads.
Costa Rica has high taxes specifically on cars. It’s a car import tax and every new car has to be imported. Someone there told me 20%, but a quick search looks like it’s 45-85%. Whatever it is, the result is most people are driving around in old cars that have higher emissions than newer cars. A lot of the stuff on the road is over 20 years old.