H.R. 3572 expands eligibility for the federal rural surface transportation grant program to include certain high-agricultural-production counties. The bill defines "covered counties" as those with at least $1 billion in annual agricultural production value and at least $500,000 in agricultural production per square mile, adjusted yearly for inflation. It also creates a new category of eligible projects called "farm-to-market roads"—roads located within these high-production agricultural counties—and requires the Secretary of Transportation to reserve 10 percent of annual grant program funding specifically for farm-to-market road projects. The Department of Transportation, working with the Department of Agriculture, must establish and update annually a list of which counties qualify as "covered counties." This change allows rural agricultural communities that meet these production thresholds to access federal transportation funding that was previously unavailable to them.