House Bill 1660, also known as Senate Bill 1646, amends Tennessee law regarding racing facilities by adding a new section to Tennessee Code Annotated, Title 29, Chapter 3. This new section defines key terms related to racing facilities, including "area of the racing facility" and "racing facility," and establishes that such facilities are not subject to nuisance or taking claims from surrounding property owners if the racing facility was established before the property owner acquired their real estate. The immunity from legal action extends to any lawful changes made to the facility, regardless of their nature.

Additionally, the bill prohibits local governments from enacting ordinances or regulations that would restrict the operation of racing facilities in a manner inconsistent with the new provisions. However, it clarifies that racing facilities must still comply with state and federal environmental laws and health and safety regulations. The act is set to take effect upon becoming law, emphasizing the importance of supporting the racing industry while balancing community interests.