Source: Tennessee General Assembly - SB 2205 / Public Chapter 854
A New Category of Transportation Law
Tennessee has created a new legal framework for a type of transportation infrastructure that barely existed in state law a year ago. Governor Bill Lee signed the Subterranean Transportation Infrastructure Coordination Act on April 27, and the measure has been assigned Public Chapter 854.
The law establishes a state-level process for qualifying underground passenger transportation projects, including permitting, inspections, dispute resolution and coordination among the public agencies and private operators involved in building below streets and other rights-of-way.
Why a New Framework Was Needed
Traditional transportation and building laws are generally organized around roads, rail lines, buildings, utilities and other familiar infrastructure. A privately financed network of passenger tunnels can cross underneath multiple jurisdictions without fitting neatly into any one of those categories.
The new law is designed to reduce overlapping or conflicting review of the subterranean portion of a project while maintaining defined standards and inspection authority. It provides a consolidated state process for subsurface construction and creates procedures for handling disagreements over approvals and jurisdiction.
A Dedicated State Authority
Public Chapter 854 creates the Subterranean Transportation Infrastructure Coordination Authority, a state entity charged with resolving disputes, hearing appeals and exercising the powers provided by the new chapter for qualifying transit projects.
The broader framework addresses legal descriptions of tunnel corridors, applications, review timelines, inspections and enforcement. It also distinguishes between surface components and subsurface components - an important issue because the entity that regulates a tunnel underground may not control a building, station entrance or street-level project above it.
What It Means for Local Government
One of the law’s most consequential provisions is a consolidated state approval process that can preempt conflicting or duplicative local permitting and inspection requirements for subsurface construction. That does not mean every surface element of a Loop project becomes exempt from local law, but it gives the state a much stronger coordinating role underground.
The distinction is likely to remain important in Nashville, where the Music City Loop follows state-controlled corridors but also depends on airport property, convention-center property and private station agreements.
Written Broadly, Relevant Immediately
The law is not written to name The Boring Company or the Music City Loop alone. It establishes a general structure that could apply to other qualifying subterranean transportation projects in Tennessee.
But the timing and subject matter make its relevance to Nashville unmistakable. The Music City Loop is already tunneling beneath state rights-of-way, and the new framework gives Tennessee a permanent regulatory structure for the kind of infrastructure now being built under the city. Administrative provisions took effect upon becoming law, with the act’s general operative provisions taking effect July 1, 2026.
Disclaimer
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