1. Short title This Act may be cited as the RTP Funding Transparency Act . 2. Nonhighway recreational fuel study (a) Definitions In this section: (1) Highway Trust Fund The term Highway Trust Fund means the Highway Trust Fund established by section 9503(a) of the Internal Revenue Code of 1986. (2) Nonhighway recreational fuel taxes The term nonhighway recreational fuel taxes means taxes under sections 4041 and 4081 of the Internal Revenue Code of 1986 with respect to fuel used in vehicles on recreational trails or back country terrain (including vehicles registered for highway use when used on recreational trails, trail access roads not eligible for funding under title 23, United States Code, or back country terrain). (3) Recreational trails program The term recreational trails program means the recreational trails program under section 206 of title 23, United States Code. (4) Secretary The term Secretary means the Secretary of Transportation. (b) Assessment