Submitted by giuliomagnifico t3_11j7a4c in science
Reply to comment by citybuildr in Study reveals that although private automobiles continue to be the dominant travel mode in American cities, the share of car trips has slightly and steadily decreased since its peak in 2001. In contrast, the share of transit, non-motorized, and taxicab trips has steadily increased by giuliomagnifico
8 per car? I'm calling shenanigans, because you're assuming those spots are "reserved" for each user, which is frankly BS.
www.strongtowns.org/journal/2019/11/27/parking-dominates-our-cities-but-do-we-really-see-it
8 is the upper end of the estimate. Of course they're not actually reserved. But the US has parking minimums that require a parking spot per area of a business (ratio depends on type of business). Many businesses will threaten to tow your car if you park there and aren't a customer (as with everything, enforcement varies). So in essence they are reserved. Most workplaces have employee lots with enough parking for all their employees to drive alone. In rural areas, this is a reasonable assumption. In urban areas, it is not. (Well, actually most urban areas in the US still have a driving mode share of 90% or higher, so it is a reasonable assumption, but it really shouldn't be, given how inefficient cars are.)
Again, you're making weird statements. Businesses have parking based on how busy they are, not based on the total size of the car-owning population. That's dumb.
Also many of these studies use computer-based ai systems that - at least in my neighborhood - treat playing fields and back alleys and the roofs of hospitals as parking structures, so I wouldn't trust those estimates.
Try about 2.5x for older cities) geographically constrained ones. In the south you might see different densities.
>Businesses have parking based on how busy they are,
Not really, no. Businesses are required to have minimum numbers of parking spots based on the square footage of the business, and a ratio determined by business type. A big box store in Tulsa needs at least 2.5 parking spots per 1,000 square feet of retail space source. That's about 500 square feet for the parking space and the adjacent aisle space, for every 1,000 feet of retail space.
In many cities, even a bar needs a parking space for every 100 square feet of interior space. A standard parking spot is bigger than that. And that's a bar, a place where people are expected to drink and therefore probably shouldn't be driving, and yet more space is devoted to parking than to the bar itself. Parking minimums are a huge waste of space.
In that first link, you'll find an analysis of parking spaces at a mall in Black Friday, the busiest shopping day of the year. Less than half the spots are used. So the parking lot could be half the size and still do its job. But because of parking minimums, we require that space to be wasted (and worse, covered in impermeable asphalt and prevents drainage and contributes to the urban heat island).
>Try about 2.5x for older cities) geographically constrained ones.
This is probably more accurate for older cities, I agree. Especially as older cities also tend to not have parking minimums for most of the dense parts, and most of these cities are more walkable and have better transit, so cars aren't required. And yet, that's still a lot of space. If every parking spot is 16'x8' (standard for a lot but on-street parking is usually about 13x6), that's 320 square feet for each car. The average person lives in about 450 square feet of space. Our cars need almost as much space as we do, that's absurd.
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