The following map is from the Center for Neighborhood Technology, which created the Housing + Transportation Affordability Index. As you can see, lots of housing in LA can be rented for less than 30 percent of median household income (everything you see in yellow). Transportation costs for the median household, on the other hand, exceed 15 percent of household income for nearly every census block group in the city. We talk a lot about housing affordability, but transportation affordability is where we're really failing our residents, and it's a direct consequence of being so heavily reliant on cars for getting around the city: