You don't need residential context. You just need US context. I have never seen an 85 MPH speed limit sign in the US, ever. Up to 65 is common, with 70 or 75 sometimes on well maintained roads between urban areas. I can't recall seeing an 80, but I feel like maybe once or twice.
There's a pretty long stretch of road between Austin and San Antonio that's 85 the whole way. It's not as big as the I-35, but the higher speed limit means it draws quite a bit of traffic for people traveling between the two cities.
Point stands: 85 is ridiculous in anything like a residential area.
