Tenn. Code § 55-10-317
Notwithstanding any other law to the contrary, an officer of any state, county, or municipal law enforcement agency that is charged with the responsibility of enforcing traffic laws may also enforce traffic laws, issue citations for violations thereof and impose fines in accordance with state law or county or municipal ordinance, as appropriate, on privately owned streets that are dedicated as rights-of-way for traffic and are located within a residential development having a combination of single family dwellings and multi-family dwellings. The enforcement of traffic laws within a private residential development shall be initiated only after the majority of residents in that development have submitted a written petition to the appropriate local governing body requesting the enforcement of traffic laws on the private street. If the local governing body approves the petition, the governing body shall establish the traffic laws in the development in the same manner as it does for public streets within its jurisdiction.
T.C.A. § 55-10-317