I don't think it's a behavioral issue, like people got used to fewer people on the roads. I can say locally the traffic never changed significantly, not even during the "lockdown" time. It was largely ignored here.
We all know COVID brain fog is a thing, people with long COVID show decreased metabolism in their brains(https://link.springer.com/article/10.1007/s00259-022-06013-2) and unintentional injury deaths are up almost 25%(https://www.ajpmonline.org/article/S0749-3797(22)00431-7/fulltext).
@BE supposedly a large part of the population is hybrid/working from home but it seems like traffic has not reflected this (maybe at certain rush hours, and on Fridays) and I think to make things worse, people might have grown an expectation that there shouldn't be a lot of cars on the road, so they're not acting as carefully as they should.