The size of the United States has not increased since 1970, but the number of people has. So yes, no shit, (US pop / US land area) has gone up. But the question is, "is the average neighborhood more dense than it was in 1970", and that's not a question you can answer from that number, because obviously cities & towns have spread since then.

If you want an intellectually honest comparison, take a look at the District of Columbia, which is basically 100% city and has been for many decades. It's gone down since 1970.

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yesfitz 3 days ago | parent [-]

No one asked that question except for you.

The other commenter and I were talking about cars.

Car ownership rates increased slightly, number of households nearly doubled, and average population density went up in every state except DC. There are more cars. Cars do not stay in one place, especially in the case of suburbanization.

Also, I'm not sure why/how the DC piece is intellectually honest. The Washington Metropolitan Statistical area has more than doubled in population since 1970[1]. Do you think all of the people who moved to PG County stay out of DC? That must be why the beltway is so easy to maneuver!

1: https://en.wikipedia.org/wiki/Washington_metropolitan_area

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floren 3 days ago | parent [-]

> unless density has increased substantially, then on any given ride you're likely to encounter similar number of vehicles than before, not counting major / commute roads of course, but those aren't the ones kids are riding on

This was the original mention of density. Sure, cars don't stay in one place, but if we're talking about kids walking/biking around their suburban neighborhood, how big is the impact if there's a new 50k suburb on the other side of the urban core? Even commuters from the exurbs are taking the dastardly 45mph stroads, not the stopsign-laden 25mph streets through your neighborhood.

The common parlance around here is that "greater density" means smaller houses closer together or multi-unit structures. If you build a new subdivision outside town, nobody says "oh wow the town got so much denser", it just got broader. Waving at "57.5 average people/square mile in 1970, growing to 93.8 in 2020" says absolutely nothing about the experience of the average person on the average streets near their homes.

	▲	yesfitz 3 days ago \| parent [-]
		All right: As an average person, I've observed that both my childhood and current neighborhoods (Mid-Atlantic and Midwest respectively) have increased in the number of cars present, and that's within and between neighborhoods. I have also observed more in-fill subdivisions between neighborhoods. Since the '90s, I've seen just the bike ride that I'd take multiple times a week in my Mid-Atlantic suburb yield one acre lots turned into 8 homes, a small office park being converted into multiple 5-over-1s, a country club being turned into 400 homes. In the past decade in the Midwest, I've seen 2 single family homes torn down to make 8 units with an 8 car garage and 8 more spaces out back, multiple small businesses torn down to make way for "luxury" student housing with a parking spot for every bed room, a shopping center and apartment complex torn down and turned into an even bigger apartment complex with parking for every bedroom. Many of these are on my block or on the bike path around town. There are more cars. There is more density. So there you go, I've provided census data, I've provided observations from my own life across multiple geographies that backs up the data. If you're claiming that there aren't more cars in neighborhoods, please back up that claim.