Datasets

2 datasets

U.S Department of Transportation

National Tunnel Inventory

The National Tunnel Inventory (NTI) records structural, operational, and safety inspection data for public highway tunnels across the United States. State departments of transportation, federal agencies, and tribal…

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Updated Oct 25, 2026

U.S Department of Transportation

Tunnels by NHS and State

This summary tables provides annual counts of tunnels on and off the National Highway System (NHS) by States and territories beginning in 2018.

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Updated Oct 25, 2026