(1) In general.—
Funds made available for the program may be used only for the following projects and activities carried out in a territory:
Eligible surface transportation program projects described in section 133 (b)
Cost-effective, preventive maintenance consistent with section 116 (d)
(C) Ferry boats, terminal facilities, and approaches, in accordance with subsections (b) and (c) of section 129.
(D) Engineering and economic surveys and investigations for the planning, and the financing, of future highway programs.
(E) Studies of the economy, safety, and convenience of highway use.
(F) The regulation and equitable taxation of highway use.
(G) Such research and development as are necessary in connection with the planning, design, and maintenance of the highway system.