"How can objects be racist?" and so on. It's not about the physical concrete and rebar, it's about how highways were planned and sliced right through some communities. You see the same thing with the statue debate, in a vacuum how can these chunks of bronze represent anything, please don't mention they were put during up a generation after the Civil War as a reaction to certain movements.
I mention all this because I saw that lady you linked to being frustrated at highways having been called racist.