US 400: its number is not the only error

The easternmost of US 400's many overlaps with other US routes.

On a recent roadtrip along US 400, my son asked me, "Isn't 400 kind of a weird number for a highway?"  Apparently even non-roadgeeks sense that there is something wrong with the US 400 designation.  But it goes beyond that.  This post examines all of the things that are wrong with US 400: not only its number, but also its purpose, its implementation, its intra-state nature, its collateral damage, and its amount of concurrent mileage with other US routes.  But I'm getting ahead of myself; let's start from the beginning...

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