(a) All Tribes must prepare a TTIP or Tribal priority list.

(b) Tribes operating with a Program Agreement or BIA self-determination contract, TTP agreement, or self-governance agreement may assume any of the following planning functions:

(1) Coordinating with States and their political subdivisions, and appropriate planning authorities on regionally significant TTP projects;

(2) Preparing NTTFI data updates and ensuring that the data is entered into the NTTFI;

(3) Facilitating public involvement;

(4) Performing traffic studies;

(5) Developing short- and long-range transportation plans;

(6) Mapping;

(7) Developing and maintaining Tribal management systems;

(8) Participating in transportation planning and other transportation related meetings;

(9) Performing transportation planning for operational and maintenance facilities;

(10) Developing TTP budgets including transportation planning cost estimates;

(11) Conducting special transportation studies, as appropriate;

(12) Researching rights-of-way documents for project planning; and

(13) Performing preliminary project planning or project identification studies.