The dedication was initiated by an act if Congress.[2] President Joe Biden signed H.R. 2278, officially designating the trail route on October 13, 2021.
The triangular-shaped trail - to the sites of the memorials in
Arlington, Virginia and New York City, and near
Shanksville, Pennsylvania - passes through six
Mid-Atlantic states and
Washington, D.C.[3] At its inception it incorporated 55% off-road trails and 45% existing roadways.[4] A 1.5 mile purpose built section was added thereafter.
Clockwise from
the Pentagon the triangular 9/11 Trail incorporates many sections of existing trais, as well as overlapping segments of the
East Coast Greenway.