"Using information on 18,300 HUD properties across 15 metropolitan areas, the researchers mapped the nationwide picture of affordable housing.
In the map below, the more expensive affordable housing is in red. In these places, transportation costs are more than 15 percent of what the typical local low-income household makes in a year. That means housing plus transportation costs are upwards of 45 percent the household’s annual income. The most affordable housing is in orange, where transportation costs are under that 15 percent threshold."