When did it become the responsibility of the federal DOT to build sidewalks?

[Sen Kit Bond (R-MO)] only dug in his heels, arguing that Americans had shown their
eagerness to use roads and bridges but would not embrace rail or
walkable infrastructure. “When did it become the responsibility of the
federal DOT to
build sidewalks?”

From streetsblog

LaHood then reminded him Congress set up dedicated funding for pedestrian improvements nearly 20 years ago.