If cars, on average, last 20 years, 10% of cars get replaced in two years time. That can be significant. I also would think cars that get replaced are driven a

If cars, on average, last 20 years, 10% of cars get replaced in two years time. That can be significant. I also would think cars that get replaced are driven a lot more kilometers per year, so chances are a lot over 10% of all kilometers driven were in newer cars. ⇒ I’m not convinced increasing the speed limit didn’t make roads less safe. Reading https://www.cato.org/sites/cato.org/files/pubs/pdf/pa346.pdf https://www.cato.org/sites/cato.org/files/pubs/pdf/pa346.pdf, fatality rate dropped from about 1.7 to about 1.6. That’s about 6%. Eyeballing figure 1 in https://www.euro.who.int/__data/assets/pdf_file/0015/43314/E92789.pdf https://www.euro.who.int/__data/assets/pdf_file/0015/43314/E..., I see a drop that could be of similar size in the EU, too. ⇒ I’m not convinced increasing the speed limits made the roads less safe, either. In general, highways are about the safest roads, anyways, so you probably would have to look at safety only on those roads with higher speeds to be able to answer the question whether safety went up/down/nowhere.