FHWA NTI Data Schema Version 1.0 - 10-05-2017 I1 - Tunnel Number I2 - Tunnel Name I3 - State Code I4 - County Code I5 - Place Code I6 - Highway District I7 - Route Number I8 - Route Direction I9 - Route Type I10 - Facility Carried I11 - LRS Route ID I12 - LRS Mile Point I13 - Tunnel Portal's Latitude I14 - Tunnel Portal's Longitude I15 - Border Tunnel State or Country Code I16 - Border Tunnel Financial Responsibility I17 - Border Tunnel Number I18 - Border Tunnel Inspection Responsibility A1 - Year Built A2 - Year Rehabilitated A3 - Total Number of Lanes A4 - Annual Average Daily Traffic A5 - Annual Average Daily Truck Traffic A6 - Year of Average Daily Traffic A7 - Detour Length A8 - Service in Tunnel C1 - Owner C2 - Operator C3 - Direction of Traffic C4 C5 - NHS Designation C6 - STRAHNET Designation C7 - Functional Classification C8 - Urban Code G1 - Tunnel Length G2 - Minimum Vertical Clearance over Tunnel Roadway G3 - Roadway Width, Curb-to-Curb G4 - Left Curb Widths G5 - Right Curb Widths D1 - Routine Inspection Target Date D2 - Actual Routine Inspection Date D3 - Routine Inspection Interval D4 - In-Depth Inspection D5 - Damage Inspection D6 - Special Inspection L1 - Load Rating Method L2 - Inventory Load Rating Factor L3 - Operating Load Rating Factor L4 - Tunnel Load Posting Status L5 - Posting Load - Gross L6 - Posting Load - Axle L7 - Posting Load - Type 3 L8 - Posting Load - Type 3S2 L9 - Posting Load - Type 3-3 L10 - Height Restriction L11 - Hazardous Material Restriction L12 - Other Restrictions N1 - Under Navigable Waterway N2 - Navigable Waterway Clearance N3 - Tunnel or Portal Island Protection from Navigation S1 - Number of Bores S2 - Tunnel Shape S3 - Portal Shapes S4 - Ground Conditions S5 - Complex I1 - Tunnel Number I3 - State Code EN short for Element Number EPN short for Element Parent Number TOTALQTY short for Element Total Quantity CS1 short for Element Quantity Condition State 1 CS2 short for Element Quantity Condition State 2 CS3 short for Element Quantity Condition State 3 9999 CS4 short for Element Quantity Condition State 4