There is, by the way, not going to be a single cent of federal funding for any of this nonsense if it passes. I am not backing the further demolition of (mostly low-income) neighborhoods to build clones of Houston’s 26-lane monstrosities. Urban freeways have done enough damage to communities already.
To clarify, there would be no demolition of neighborhoods, if it needs to pass through a neighborhood, it'd be built at an elevated height (i.e. above the buildings). Also I'd expect most of the expansion to be done in rural areas, urban areas can probably mostly just have the lanes be repurposed.
So their property values decline due to the screaming of cars and overpasses over them.