Section 170.470 - Which construction standards must Tribes use?(a) Tribes must either:(1) Use the approved standards referred to in § 170.454 ; or(2) Request approval for any other road and highway bridge construction standards that are consistent with or exceed the standards referred to in § 170.454 .(b) For designing and building eligible intermodal projects funded by the TTP, Tribes must use either: (1) Nationally recognized standards for comparable projects; or(2) Tribally adopted standards that meet or exceed nationally recognized standards for comparable projects.