Study: Nearly a third of downtown Detroit is parking

Context: Parking takes up space that could be used for real estate development that brings jobs or housing, activist group Detroiters for Parking Reform argues, per Detour.

• Plus, an emphasis on driving de-incentivizes public transit and makes cities less walkable, Parking Reform contends. Low-income residents who are less likely to have cars end up subsidizing parking costs for higher-income residents.

Zoom out: Arlington, Texas had the highest percentage of downtown parking (42%), while San Francisco and Chicago's central areas were among those with the lowest (4%).

• Columbus scored 27%, Atlanta 25% and Pittsburgh 18%, per Parking Reform.

Between the lines: The network's parking maps include surface lots and above-ground structures, but not underground parking or structures that take up multiple floors of a building.

• The maps measure the cities' "densest, most centrally located, and most valuable real estate."

Of note: Parking Reform's map includes downtown and Greektown but not the Ilitch-owned, parking-heavy areas around Little Caesars Arena.