You’re off by about 20 years - it was the 1920s when car manufacturers were able to get legislation restricting public streets to their customers[1] - but also this ignores the magnitude: yes, cars have always been a public health hazard but the manufacturers reversed a multi-decade safety improvement trend a decade or two back because it boosted their profits, and that happened only in the United States. If our roads were as safe as Germany’s, while still not absolutely safe there would be an annual death toll reduction in the tens of thousands and 1-2 orders of magnitude more for series injuries. That’s huge even if it’s not perfect.
1. https://www.vox.com/2015/1/15/7551873/jaywalking-history