Roadway Design Standards

Revised: July 30, 2025
CONTEXTUAL TYPICAL SECTIONS AND DESIGN DECISION
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD-CTS-R1 IB 25-08   CONTEXTUAL TYPICAL SECTIONS RURAL ARTERIAL
RD-CTS-R2 IB 25-08   CONTEXTUAL TYPICAL SECTIONS RURAL COLLECTOR
RD-CTS-R3 IB 25-08   CONTEXTUAL TYPICAL SECTIONS RURAL LOCAL
RD-CTS-RT1 IB 25-08   CONTEXTUAL TYPICAL SECTIONS RURAL TOWN ARTERIAL
RD-CTS-RT2 IB 25-08   CONTEXTUAL TYPICAL SECTIONS RURAL TOWN COLLECTOR
RD-CTS-RT3 IB 25-08   CONTEXTUAL TYPICAL SECTIONS RURAL TOWN LOCAL
RD-CTS-S1 IB 25-08   CONTEXTUAL TYPICAL SECTIONS SUBURBAN ARTERIAL
RD-CTS-S2 IB 25-08   CONTEXTUAL TYPICAL SECTIONS SUBURBAN COLLECTOR
RD-CTS-S3 IB 25-08   CONTEXTUAL TYPICAL SECTIONS SUBURBAN LOCAL
RD-CTS-U1 IB 25-08   CONTEXTUAL TYPICAL SECTIONS URBAN ARTERIAL
RD-CTS-U2 IB 25-08   CONTEXTUAL TYPICAL SECTIONS URBAN COLLECTOR
RD-CTS-U3 IB 25-08   CONTEXTUAL TYPICAL SECTIONS URBAN LOCAL
RD-CTS-UC1 IB 25-08   CONTEXTUAL TYPICAL SECTIONS URBAN CORE ARTERIAL
RD-CTS-UC2 IB 25-08   CONTEXTUAL TYPICAL SECTIONS URBAN CORE COLLECTOR
RD-CTS-UC3 IB 25-08   CONTEXTUAL TYPICAL SECTIONS URBAN CORE LOCAL
RD18 ROADWAY TYPICAL SECTIONS AND DESIGN CRITERIA
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD18-TS-1 IB 25-08   RURAL LOCAL ROADS (LOW-VOLUME)
RD18-TS-2 IB 25-08   URBAN LOCAL ROADS AND STREETS
RD18-TS-2A IB 25-08   RURAL LOCAL ROADS AND STREETS
RD18-TS-3 IB 25-08   URBAN MINOR COLLECTOR (2-3 LANE)
RD18-TS-3A IB 25-08   RURAL MINOR COLLECTOR (2-LANE)
RD18-TS-4 IB 25-08   URBAN MAJOR COLLECTOR FLUSH MEDIAN (4-5-6 LANE)
RD18-TS-4A IB 25-08   URBAN MAJOR COLLECTOR RAISED MEDIAN (4-5-6 LANE)
RD18-TS-4B IB 25-08   URBAN MAJOR COLLECTOR DEPRESSED MEDIAN (4-5-6 LANE)
RD18-TS-4C IB 25-08   RURAL MAJOR COLLECTOR FLUSH MEDIAN (4-5-6 LANE)
RD18-TS-4D IB 25-08   RURAL MAJOR COLLECTOR DEPRESSED MEDIAN (4-6 LANE)
RD18-TS-5 IB 25-08   URBAN MINOR ARTERIAL (2-3 LANE)
RD18-TS-5A IB 25-08   RURAL MINOR ARTERIAL (2-3 LANE)
RD18-TS-6 IB 25-08   URBAN MAJOR ARTERIAL FLUSH MEDIAN (4-5-6 LANE)
RD18-TS-6A IB 25-08   URBAN MAJOR ARTERIAL RAISED MEDIAN (4-5-6 LANE)
RD18-TS-6B IB 25-08   URBAN MAJOR ARTERIAL DEPRESSED MEDIAN (4-6 LANE)
RD18-TS-6C IB 25-08   RURAL MAJOR ARTERIAL FLUSH MEDIAN (4-6 LANE)
RD18-TS-6D IB 25-08   RURAL MAJOR ARTERIAL DEPRESSED MEDIAN (4-6 LANE)
RD18-TS-7 IB 25-08   FREEWAYS WITH DEPRESSED MEDIAN (4-6 LANE)
RD18-TS-7A IB 25-08   FREEWAYS WITH MEDIAN BARRIER (4-6 LANE)
RD18-TS-7B IB 25-08   INDEPENDENT ROADWAYS (4-6 LANE)
RD18-TS-7C IB 25-08   TYPICAL DETAILS FOR INSIDE LANE WIDENING OF FREEWAYS
RD18-TS-8 IB 25-08   RAMPS (1-2-3 LANE)
RD18 ROUNDABOUT TYPICAL SECTIONS AND DESIGN CRITERIA
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD18-RTS-1     DESIGN STANDARDS FOR SINGLE LANE URBAN AND RURAL ROUNDABOUTS
RD18-RTS-2     DESIGN STANDARDS FOR MULTI-LANE URBAN AND RURAL ROUNDABOUTS
RD18-RTS-3 IB 25-05 04/30/2025 STANDARD CONSTRUCTION DETAILS FOR ROUNDABOUTS
RD18-RSD-1     SIGHT DISTANCE FOR URBAN AND RURAL ROUNDABOUTS
       
RD11 TYPICAL SECTIONS AND DESIGN CRITERIA
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD11-SE-1     TRANSITION AND CROSS SLOPE DETAILS
RD11-SE-2     SUPERELEVATION TRANSITION DETAILS FOR UNDIVIDED ROADWAYS
RD11-SE-2A     SUPERELEVATION TRANSITION SECTIONS FOR UNDIVIDED ROADWAYS
RD11-SE-3     SUPERELEVATION TRANSITION DETAILS FOR DIVIDED ROADWAYS
RD11-SE-3A     SUPERELEVATION TRANSITION SECTIONS FOR DIVIDED ROADWAYS
RD11-TS-1
  06/28/2019 DESIGN STANDARDS FOR LOW-VOLUME ROADS
RD11-TS-1A     06/28/2019 DESIGN STANDARDS FOR LOCAL ROADS AND STREETS
RD11-TS-2     DESIGN STANDARDS FOR COLLECTORS, 2-LANE ROADS AND STREETS
RD11-TS-2A     DESIGN STANDARDS FOR COLLECTOR HIGHWAYS WITH DEPRESSED MEDIAN (4 AND 6 LANE)
RD11-TS-2B     DESIGN STANDARDS FOR COLLECTOR HIGHWAYS WITH FLUSH MEDIAN (4 AND 6 LANE)
RD11-TS-3     DESIGN STANDARD FOR ARTERIAL HIGHWAYS (2-LANE)
RD11-TS-3A
  06/28/2019 DESIGN STANDARDS FOR ARTERIAL HIGHWAYS WITH DEPRESSED MEDIAN (4 AND 6 LANE)
RD11-TS-3B     DESIGN STANDARDS FOR ARTERIAL HIGHWAYS WITH FLUSH MEDIAN (4 AND 6 LANE)
RD11-TS-3C     DESIGN STANDARDS FOR ARTERIALS WITH INDEPENDENT ROADWAYS (4 AND 6 LANE)
RD11-TS-4 IB 24-09 10/1/2024 DESIGN STANDARDS FOR ARTERIAL AND FREEWAY RAMPS (1, 2 AND 3 LANE)
RD11-TS-5
  06/28/2019 DESIGN STANDARDS FOR FREEWAYS WITH DEPRESSED MEDIAN (4 AND 6 LANE)
RD11-TS-5B     DESIGN STANDARDS FOR FREEWAYS WITH MEDIAN BARRIER (4 AND 6 LANE)
RD11-TS-5W   06/15/2021 TYPICAL DETAILS FOR INSIDE LANE WIDENING OF FREEWAYS
RD11-TS-6     TYPICAL CURB & GUTTER SECTIONS WITH SHOULDERS AND WITH GRASS STRIPS
RD11-TS-6A     TYPICAL CURB & GUTTER SECTIONS WITHOUT SHOULDERS AND WITH GRASS STRIPS
RD11-TS-6B     TYPICAL CURB AND GUTTER SECTIONS WITH SHOULDERS AND WITHOUT GRASS STRIPS
RD11-TS-6C     TYPICAL CURB AND GUTTER SECTIONS WITHOUT SHOULDERS AND WITHOUT GRASS STRIPS
RD11-TS-7   07/17/2020 DESIGN STANDARDS 2-LANE CURB & GUTTER WITH CONTINUOUS 2-WAY LEFT-TURN LANE WITHOUT GRASS STRIPS
RD11-TS-7A   07/17/2020 DESIGN STANDARDS 2-LANE CURB & GUTTER WITH CONTINUOUS 2-WAY LEFT-TURN LANE WITH GRASS STRIPS
RD11-TS-7B IB 25-08 06/12/2025 DESIGN STANDARDS 2-LANE HIGHWAYS WITH CONTINUOUS 2-WAY LEFT-TURN LANE
       

RD11 SLOPE DEVELOPMENT AND RUNOFF LENGTHS
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD11-LR-1     MINIMUM RUNOFF LENGTHS (Lr) FOR URBAN HIGHWAYS
RD11-LR-2     MINIMUM RUNOFF LENGTHS (LR) FOR RURAL HIGHWAYS
RD11-S-11     DESIGN AND CONSTRUCTION DETAILS FOR ROADSIDE SLOPE DEVELOPMENT
RD11-S-11A     ROADSIDE DITCH DETAILS FOR DESIGN AND CONSTRUCTION
RD11-S-11B     DESIGN AND CONSTRUCTION DETAILS FOR ROCK CUT SLOPE AND CATCHMENT
RD11-SA-1 IB 24-03 01/09/2024 SAFETY APPROACH TO UNDERPASSES GRADING DESIGN AND SLOPE PROTECTION

RD11 INTERSECTION SIGHT DISTANCE
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD11-SD-1     INTERSECTION SIGHT DISTANCE DESIGN AND GENERAL NOTES
RD11-SD-2     INTERSECTION SIGHT DISTANCE LANDSCAPE AND OBSTRUCTION
RD11-SD-3     INTERSECTION SIGHT DISTANCE 2-LANE ROADWAYS
RD11-SD-4     INTERSECTION SIGHT DISTANCE 4-LANE AND 5-LANE UNDIVIDED ROADWAYS
RD11-SD-5     INTERSECTION SIGHT DISTANCE 4-LANE DIVIDED HIGHWAYS
RD11-SD-6     INTERSECTION SIGHT DISTANCE 6-LANE DIVIDED HIGHWAYS
RD11-SD-7     INTERSECTION SIGHT DISTANCE FOR PASSIVE RAILROAD HIGHWAY GRADE CROSSINGS
       

UNDERDRAINS
DRAWING RELATED IB REVISION DATE DESCRIPTION
RD-UD-3                        IB 24-03
01/09/2024
UNDERDRAIN DETAILS
RD-UD-4    
06/28/2019
UNDERDRAIN LATERAL DETAILS
RD-UD-6
 
06/28/2019
LATERAL UNDERDRAIN ENDWALL DETAIL FOR 1:1 & 2:1 SLOPES
RD-UD-7
 
06/28/2019
LATERAL UNDERDRAIN ENDWALL DETAIL FOR 3:1 & 4:1 SLOPES
RD-UD-8
  06/28/2019
LATERAL UNDERDRAIN ENDWALL DETAIL FOR 5:1 SLOPES
RD-UD-9
 
06/28/2019
LATERAL UNDERDRAIN ENDWALL DETAIL FOR 6:1 SLOPES
       

If you find any mistakes, missing information or have a question, contact:
TDOT Engineering Production Support
1200 James K. Polk Building
Nashville, TN 37243-1402
TDOT.EngineeringProductionSupport@tn.gov

This Page Last Updated: September 22, 2025 at 2:18 PM