Numbering streets: Ur doin it wrong

Visitors to modern Troy, New York are frequently perplexed by the one-way streets, and by the fact that  First through Fourth are streets, Fifth, Sixth and Eighth are avenues, and Seventh has mostly disappeared. Fine. That’s nothing compared to the confusion of olden Troy, say 1895, when Fourth Street ran between Sixth and Eighth.

I offer no explanation. No, it does not make sense if you look further down the map to the rest of Fourth Street.