even in your link some EU countries reported increases.
The biggest problem I run into is two lane highways where the semi trucks constantly block the left lane going just at the speed limit while trying to pass other semis in the right lane going just under the speed limit - literally a 1mph difference between the two. The speed limit for cars is 10mph above the truck limit but your lucky to do the truck limit consistently. California was particularly bad in that regard.
People from Oaklahoma are also a constant scourge on the road, they can not tolerate someone going faster then them, so if you try to pass on the left they will pull in front of you and bumble along at the speed limit or one mile over (def a culture thing, cops in OK have a zero tolerance policy for speeding, no margin, regardless of conditions, passing, etc.). On an open road you can just pass them on the right but in any moderate traffic they cause a lot of problems. Check the plates the next time someone does that, pattern isn’t hard to see.
Roads in West Virginia are basically paved over goat trails, I watched some douche in a pickup take a blind 5 mph turn at about 85mph trying to blow past a small sedan he obviously thought was going to slow and wedged himself in a stream about forty feet beyond the road. Luckily nobody was coming the other way around he turn or it could have been really tragic.
Looks to me like there's a general societal breakdown, also looking at the proliferation of videos of people walking out of stores with stuff they didn't pay for.
Generally speaking, emptier roads encourage more speeding and reckless driving, increasing the severity of car accidents.