The tribe, or BIA after consultation with the appropriate tribe and other involved agencies, determines whether or not a public hearing is needed for an IRRTIP, long-range transportation plan or project. A public hearing must be held if a project:
(a) Is a new route or facility;
(b) Would significantly change the layout or function of connecting or related roads or streets;
(c) Would cause a substantial adverse effect on adjacent property; or
(d) Is controversial or expected to be controversial in nature.