6 1/2 Avenue

If you’ve never heard of it, that may be because this quarter-mile, pedestrian-only street is nearly hidden among the office towers of Midtown. Sixth-and-a-Half Avenue was the first fractional street in the city’s grid system, created in 2012 by the Department of Transportation to encourage people to use the public plazas and covered areas that form a path between 51st Street to 57th Street.

So where is it?