Earlier quoted context omitted.
Removing parking spaces puts more cars on the road -- circling for spots and parking illegally in traffic lanes. If you want faster buses, evict the cars from the bus travel lanes.
Yeah, except no. This is just one of those tropes that motorists use to force cities to subsidize them. Every study on this topic has conclusively shown that parking causes traffic. The construction of parking precedes the worsening of traffic, the amount of parking built is proportional to the amount of traffic observed, and the reverse process is also observed to correct the problem: removing parking alleviates tra…
Same with parking. You build parking in areas where you anticipate increased demand or already have unmet demand. By building parking, you increase your capacity to meet that demand.
If you have unmet demand (i.e. not enough spaces for the volume of vehicles that wish to park in an area), you're limiting the economic throughput of that area. Yes, you're reducing traffic congestion in the process, but at a very real economic cost for those whom were being patronized by that now-gone traffic.
Same with anticipating new demand. If you're building in an area, you want to be sure the area has enough parking capacity to absorb the intended volume of people traffic your building will have. If you're building a new skyscraper or mall or big box store, that's likely not true. So you incorporate parking into your project. Once your building (and parking) come online, you'll start attracting a higher volume of individuals to an area. Which, except for the most underutilized or mature transportation networks, will have a corresponding impact on congestion due to the greater throughput of individuals to the area.
If you have mature public transportation, then your transportation network likely has the bandwidth to absorb this throughput increase with a lesser impact on congestion than if you're in an area with immature public transportation options. But mature public transportation tends to be very expensive to build and maintain. Which is only likely to happen after growing to the point of having heavy enough congestion to make such expensive and regionally disruptive changes both politically palatable and economically feasible.
I do not envy urban and transportation planners.