Tennessee Code Title 13. Public Planning and Housing § 13-10-101

(1) “Commissioner” means the commissioner of transportation;

(2) “Department” means the department of transportation;

(3) “Local government” means an incorporated municipality, county, agency or instrumentality of an incorporated municipality or county, two (2) or more of the foregoing acting jointly, or an authority established by law to provide mass transportation services, or a nonprofit corporation authorized to provide mass transportation services;

(4) “Mass transportation project” means the planning, acquisition, construction, reconstruction, improvement, maintenance or operation of any mass transportation system or capital equipment used in connection therewith;

(5) “Project cost” means actual or estimated cost of a mass transportation project, including relocation assistance payments, or the estimated reasonable cost thereof as approved by the commissioner, whichever is lower, less any federal assistance received or to be received for the project; and

(6) “Rail fixed guideway public transportation system” has the same meaning as provided in 49 CFR Part 674.