Comment by andriamanitra

> So they hurt quality of life by making it more painful to get anywhere, taking time away from everyone’s lives. You can achieve no traffic deaths by slowing everyone to a crawl. That doesn’t make it useful or good. The goal should be fast travel times and easy driving while also still reducing injuries, which newer safety technologies in cars will achieve.

Like others have pointed out making road speeds faster barely makes a dent in travel times. The absolute best way to reduce travel times is to build denser cities, which incidentally means less parking, narrower roads, and, most importantly, fewer cars. In a densely populated area it's impossible to match the throughput of even a small bike path with anything built for cars. Safety is just a bonus you get for designing better, more efficient, more livable cities.