Giant trucks
Cellphones
Speeding
Alcohol
Marijuana
Homelessness
Deaths are up because the decisions individual car drivers are making are more dangerous to pedestrians, cyclists, and other drivers (and pollution wise, society at large). And those drivers are generally insulated from their dangerous decisions. the absurdist verbage used in reporting the killing of pedestrians by motorists is a mirror on how our society blames those who are killed.
At my job in the ER I see people who have been injured every day. These are the reasons, and these things have changed (except alcohol, which has been an ever present danger, though was actualy reported to be decreasing pre-covid).
The USA didn’t change their roads to be even more car centric in the last 10 years, but deaths are up. The USA didn’t make headlights different in the last 10 years, but deaths are up at night. The USA didn’t grow more fragile pedestrians, ,but deaths are up. The USA hasn’t had a massive increase in bicyclists or pedestrians, but deaths are up.
Insead, the USA decided to have more giant trucks, more cellphone use, more speeding, more alcohol use, more marijuana use while driving, and has more homeless folk than the last 30+ years.
Homelessness is the odd outlier - and the best discussions I’ve read about it are because the homeless are often forced to camp and sleep near busy high speed roads, and that makes them more vulnerable to getting run over, and all the other factors work towards that same thing.
This R&T article (what a crummy website, their print edition of the article is much easier to read) talks about the most deadly vehicles. Deaths are up because the decisions individual car drivers are making are more dangerous to pedestrians, cyclists, and other drivers. You have to click the View Gallery button to read the article small bit by small bit - horrid design. https://www.roadandtrack.com/news/g44567280/cars-most-deadly-to-other-drivers/