170.116—What activities are not eligible for IRR Program funding?
IRR Program funds cannot be used for any of the following:
(a)
Routine maintenance work such as: grading shoulders and ditches; cleaning culverts; snow removal, roadside mowing, normal sign repair and replacement, painting roadway structures, and the maintaining, cleaning, or repair of bridge appurtenances;
(e)
Work performed on projects that are not included on an FHWA-approved IRR Transportation Improvement Program (TIP), unless otherwise authorized by the Secretary of the Interior and the Secretary of Transportation;