; and (3) an analysis of how the proposed traffic barrier installation project will mitigate those risks. (e) Use of funds A recipient of a grant under this section— (1) shall be the direct recipient of the grant; and (2) may only use the grant funds for a traffic barrier installation project. (f) Federal share The Federal share of the costs of a traffic barrier installation project carried out with a grant under this section may be up to 100 percent. (g) Authorization of appropriations There is authorized to be appropriated to the Secretary to carry out this section $50,000,000 for each of fiscal years 2018 through 2027.