The Tribe, or BIA or FHWA after consultation with the appropriate Tribe and other involved agencies, determines whether or not a public hearing is needed for a TTPTIP, a LRTP, or a project. A public hearing must be held if a project:

(a) Is for the construction of 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.