Provides funds to construct roads and trails within (or, in some cases, providing access to) Federal lands. There are four categories of FLHP funds: Indian Reservation Roads, Public Lands Highways, Park Roads and Parkways, and Refuge Roads. Funds available to the US Forest Service may be used for forest development roads and trails. To be eligible for funding, projects must be open to the public and part of an approved Federal land management agency general management plan. 23 U.S.C. 204.