Downtown Seattle is 10% parking. That's less than other cities

• The average city center in the U.S. is 20% surface parking, according to the group.

Why it matters: The more space devoted to parking, the less that's available for housing, parks and retail, which creates less pedestrian-friendly cities and can drive up housing costs, the organization says.

Context: Seattle has implemented policies to do away with parking minimums for all buildings downtown except for hospitals, the Parking Reform Network notes.

• The city has also relaxed parking requirements in neighborhood commercial centers and in areas with frequent transit stops.
• These types of policies help reduce car use and pollution from vehicles, while making neighborhoods more walkable, according to the group.