With people on their phones, roads will have to become obstacle courses with speed bumps and undulating curve to force people to pay attention.
Philadelphia's solution to speeding has been speed bumps. Sounds great until you realize there are no specs for this, and some of them are so high that nearly every 10th car going over now makes an extremely loud scraping sound. Now imagine living in front of that!
I ride a motorcycle most times and I am always at very high attention when riding. I see people scrolling TikTok not only at lights, but flying through town. I see they didn't find a cause there, but it seems so prevalent and dangerous that it has to have caused an uptick in accidents as well as deaths. That data feels very fishy for it to be so different between regions (there is not a different culture in different areas for phone use).
I also wonder if there are a few confounders, covid, number of cars on road, safety of cars, and local code rules on what constitutes a registered vehicle (this is more variable than you think). In some places, if it rolls, you can register it. NJ has mandatory 2y state inspection.
At least we have Roosevelt Boulevard, the most dangerous roadway in the entire US! We're #1! (It is literally called: The Corridor of DEATH) https://whyy.org/articles/philly-roosevelt-blvd-rising-traff... I think it goes up to 12 lanes wide at some point WITH a pedestrian crossing.