A design prototype by Datopian, not an official website
Find a Commonwealth ResourceU.S Department of Transportation
The National Transportation Library (NTL) provides national and international access to transportation information, coordinates information creation and dissemination, and provides reference services for Department of…
Updated Oct 25, 2026
U.S Department of Transportation
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…
Updated Oct 25, 2026
U.S Department of Transportation
This summary tables provides annual counts of tunnels on and off the National Highway System (NHS) by States and territories beginning in 2018.
Updated Oct 25, 2026
U.S Department of Transportation
The NTI is an aggregation of structure inventory and appraisal data of tunnels located on public roads submitted by States, Federal agencies and Tribal governments in accordance with the National Tunnel Inspection…
Updated Oct 25, 2026
U.S Department of Transportation
The National Transportation Library Catalog is charged with improving the availability of transportation-related information needed by Federal, state, and local decision-makers. Its mission is to increase timely access…
Updated Oct 25, 2026
Hampton Roads PDC & Hampton Roads TPO
Locations of the bridge-tunnel facilities in Hampton Roads, Virginia
Updated Oct 6, 2026
