Someone has to put a chart near it, describing the decline in driving in the city. When you're limited to 30kmh, you might as well get a scooter...
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I used to live in Amsterdam which has a great public transport, great cycling paths, and limits of 30km/h. People are going cycling to school, on dates, and picnic with their families. Associating having a 3 ton gas guzzler as a prerequisite of having a family and a roadblock of "society" is only a question of poor imagination.
https://www.yahoo.com/lifestyle/six-health-lessons-learn-net...
There are multiple reasons Americans are obese as hell and living shorter than us Europeans, and driving everywhere is one of it.
If one needs excuses to justify having a car and being stuck in traffic, hills ain't a valid one. 30km/h is great, makes for less noise, less air pollution, and now we see, it makes it for 0 traffic deaths. Much better to have the option to reach a grocery store on foot, by bike, by public transport and car than have no options but a car. That makes for less cars on the road, and, funnily enough, 30km/h on a non-busy road will often get you faster to where you want to go than 50 on a busy one.
Again, that's why we Europeans are both happier and fitter than our American counterparts.