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(last updated 12/9/2023)
Lots of people (myself included) have an odd fascination with the superlatives of just about any topic. As it relates to highways, a common question is "What is the longest US route?" (answer) And then related questions branch off from there:
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When the US route system was conceived in the mid-1920s, one of the guidelines was that the longer, more important routes would be assigned 1- and 2-digit numbers. Given that, US 46 really seems like an outlier. At only 75 miles in length, it is the shortest of all 1- and 2-digit US routes. Not only that, but US 46 is entirely in one state (New Jersey). Why would AASHO consider a short, single-state highway to be worthy of a 2-digit US route designation? Historic documents in their route numbering archive reveal at least some of the answers. As it turns out, when US 46 was first proposed in the mid-1930s, it was envisioned as a route running between New York City and Cleveland, along the corridor shown on this map:
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