[dionidium]

I don't strongly disagree with your point here, but like all city statistics that aren't normalized for area and density (e.g. by using the MSA/CSA or some equivalent), this one is potentially quite misleading. Kansas City draws its borders around an awful lot of rural land that wouldn't be (indeed, isn't) counted inside the borders of most cities. This is all well within the city limits, for example:

https://goo.gl/maps/Dm76roteRbx

All of which is just to say: political borders are drawn differently in every city, so you can't meaningfully compare cities using political borders.

Does Kansas City (as a region) actually have more highways than most equivalent cities? Maybe. I don't know. That table doesn't tell us that.