; (ii) to protect public health and safety; (iii) to respond to an emergency; and (iv) for the control of fire, insects, or diseases, subject to such terms and conditions as the Secretary concerned determines to be appropriate. (C) Effect Subject to appropriations, the Secretary concerned shall maintain existing roads determined by the Secretary concerned, in consultation with the applicable Tribal commission, to be necessary for authorized existing uses and the administration of the Tribal cultural area. (5) Motorized vehicles (A) In general Except as provided in subparagraph (B), the use of motorized vehicles in a Tribal cultural area shall be permitted only on roads designated by the management plan for the use of motorized vehicles. (B) Exception The use of motorized vehicles shall be permitted in a Tribal cultural area on roads not designated by the management plan for the use of motorized vehicles in cases in which the use is— (i) necessary— (I) for administrative purposes; (II) to respond to an emergency; or (III) for traditional cultural purposes, including the exercise of rights secured by treaty, statute, Executive order, or other Federal law; or (ii) determined necessary by the applicable Tribal commission. (C) Savings clause Nothing in this paragraph authorizes the use of motorized vehicles on public land (as defined in section 10(d)(1)) within a Tribal cultural area if the use is otherwise prohibited on the public land. (6) Grazing (A) In general Subject to subparagraph (B), the grazing of livestock in a Tribal cultural area established before the date on which the Tribal cultural area is designated for inclusion in the System shall be permitted to continue. (B) Requirement (i) Consistency required Grazing permitted under subparagraph (A) shall be— (I) subject to— (aa) a determination by the Secretary concerned, in consultation with the applicable Tribal commission, that grazing may be carried out in a manner consistent with the purposes for which the Tribal cultural area is established