the.com/main drag

The one street in town trying to do the job of a whole downtown.

means The primary street of a town or neighborhood, where most of the shops, traffic, and action are concentrated.

from American slang from the 19th century, when 'drag' was used to mean a street (likely tied to the dragging sensation of horse-drawn wheels or feet trudging over it). 'Main drag' simply paired that slang with 'main' to mark the central thoroughfare — the one street everything else orbits.

origin
drag meant street in 1800s slang
usage
implies shops, bars, and one weird statue
small towns
often the only street with traffic lights
irony
rarely feels like a drag unless you live there
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