Safety Design and Guardrails

Revised: April 1, 2024
CLEAR ZONE AND SAFETY PLANS
DRAWING RELATED IB REVISION DATE DESCRIPTION
  06/28/2019
CLEAR ZONE CRITERIA
IB 23-04 03/01/2023 SAFETY PLAN FOR BARRIER LENGTH OF NEED
S-PL-1A IB 23-04 03/01/2023 SAFETY PLAN FOR BARRIER LENGTH OF NEED (FOR RIGID OBJECTS)
S-PL-1B IB 23-04 03/01/2023 SAFETY PLAN FOR BARRIER LENGTH OF NEED ON CURVED ROADWAYS
IB 23-04 03/01/2023
SAFETY PLAN MINIMUM INSTALLATION AT BRIDGE ENDS
IB 24-03 01/09/2024
SAFETY PLAN FOR BRIDGE PIERS IN CLEAR ZONE
S-PL-4A IB 24-03 01/09/2024 SAFETY PLAN FOR BRIDGE PIERS IN CLEAR ZONE & OUT OF CLEAR ZONE
  06/28/2019
SAFETY PLAN FOR BRIDGE ENDS IN MEDIANS
  06/15/2021
SAFETY PLAN SAFETY HARDWARE PLACEMENT ON OUTSIDE EDGE
  06/28/2019
SAFETY PLAN SAFETY HARDWARE PLACEMENT IN MEDIAN
       

CABLE BARRIER
DRAWING RELATED IB REVISION DATE DESCRIPTION
IB 24-03 01/09/2024
CABLE BARRIER PLACEMENT
S-CB-2 IB 23-11 07/07/2023 HIGH TENSION CABLE BARRIER
       

CRASH CUSHIONS
DRAWING RELATED IB REVISION DATE DESCRIPTION
IB 24-03
01/09/2024
CRASH CUSHION
  06/28/2019
CRASH CUSHION (GATING) BARREL ARRAY
       

 GUARDRAIL DETAILS
DRAWING RELATED IB REVISION DATE DESCRIPTION
 
06/15/2021
GUARDRAIL DETAILS
  06/28/2019
GUARDRAIL AND BLOCK-OUT DETAILS
S-GR31-1B
    GUARDRAIL FASTENING HARDWARE
S-GR31-1C IB 23-11 07/07/2023 GUARDRAIL GENERAL NOTES AND POST DETAILS
S-GR31-1D IB 23-04 03/01/2023 GUARDRAIL POST PLACEMENT IN ROCK
       

GUARDRAIL CONNECTIONS
DRAWING RELATED IB REVISION DATE DESCRIPTION
S-GRC-4 IB 23-11 07/07/2023 GUARDRAIL CONNECTION TO BRIDGE RAILING CONCRETE PARAPET
S-GRC-5
  02/28/2020 GUARDRAIL CONNECTION TO BRIDGE ENDS (TRAILING ENDS)
S-GRC-6 IB 23-11 07/07/2023 GUARDRAIL CONNECTION TO BRIDGE ENDS FOR LOW SPEED ROADWAYS
       

GUARDRAIL (SPECIAL CASES)
DRAWING RELATED IB REVISION DATE DESCRIPTION
S-CPW-1
    CURVED PARAPET WALL ≤ 40 M.P.H.
 
06/15/2021
SPECIAL CASE LONG SPAN GUARDRAIL 1 POST, 2 OR 3 POSTS OMITTED
 
01/28/2022
SPECIAL CASE GUARDRAIL ATTACHMENT TO CONCRETE DECKS
 
06/28/2019
SPECIAL CASE GUARDRAIL FOOTING
 
05/04/2022
SPECIAL CASE GUARDRAIL HEIGHT TRANSITION DETAIL
S-GRS-5     SPECIAL CASE WEAK-POST GUARDRAIL ATTACHMENT TO CULVERT
S-GRS-5A   06/15/2021 WEAK-POST GUARDRAIL ASSEMBLY DETAILS FOR TYPE 1 & 2
S-GRS-5B       WEAK-POST GUARDRAIL ASSEMBLY DETAILS FOR TYPE 3 & 4
S-GRS-6     SPECIAL CASE FLEXIBITLTY ON GUARDRAIL POST INSTALLATIONS
S-GRS-7 IB 24-03 01/09/2024 SHORT – RADIUS GUARDRAIL SYSTEM (SRGS)
S-GRS-7A IB 24-03 01/09/2024 SHORT – RADIUS GUARDRAIL SYSTEM (SRGS) DETAILS
S-GRS-7B IB 24-03   SHORT RADIUS-GR SYSTEM (SRGS) EYE-BOLT SPACING DETAILS

GUARDRAIL TERMINALS
DRAWING RELATED IB REVISION DATE DESCRIPTION
 
10/29/2021
TYPE 12 GUARDRAIL TERMINAL BURIED-IN-BACKSLOPE
S-GRT-1A     LAYOUT OF FLARED GUARDRAIL (TL- 3)
S-GRT-1B     LAYOUT OF FLARED GUARDRAIL (TL- 2)
 
06/28/2019
TYPE 38 GUARDRAIL END TERMINAL
 
10/16/2020
EARTH PAD FOR TYPE 38 AND TYPE 21 TERMINAL
 
06/28/2019
EARTH PAD FOR TYPE 38 AND TYPE 21 TERMINALS (RETROFIT)
 
06/28/2019
TYPE 21 GUARDRAIL END TERMINAL
S-GRT-4 IB 24-03   TYPE 21 GATING END TERMINAL
S-GRT-4A IB 24-03   TYPE 21 GATING END TERMINAL ANCHOR DETAILS
S-GRT-4B IB 24-03   GATING TERMINAL POST & RAIL DETAILS

GUARDRAIL ANCHORS
DRAWING RELATED IB REVISION DATE DESCRIPTION
 
06/28/2019
TYPE 12 GUARDRAIL ANCHOR
  06/28/2019
GUARDRAIL ANCHOR FOR TYPE 12 TERMINAL (ALTERNATIVE)
 IB 24-03 01/09/2024
TYPE 13 GUARDRAIL ANCHOR
IB 23-04 03/01/2023
IN-LINE GUARDRAIL ANCHOR
  06/28/2019
FLARED GUARDRAIL ANCHOR
       

CONCRETE MEDIAN BARRIERS
DRAWING RELATED IB REVISION DATE DESCRIPTION
 
01/28/2022
32” SINGLE SLOPE CONCRETE BARRIER WALL
S-SSMB-1A   10/29/2021 36" SINGLE SLOPE CONCRETE BARRIER WALL
  10/29/2021
51” SINGLE SLOPE CONCRETE BARRIER WALL
  10/29/2021
51” HALF SIZE SINGLE SLOPE CONCRETE BARRIER WALL
  07/17/2020
FLARED SINGLE SLOPE CONCRETE MEDIAN BARRIER WALL (VERTICAL BACK)
  05/01/2020
SINGLE SLOPE MEDIAN BARRIER WALL CATCH BASIN DETAIL
 
06/28/2019
32" CONCRETE SINGLE SLOPE BARRIER WALL WITH SINGLE GUARDRAIL ATTACHMENT
S-SSMB-6A
    36” CONCRETE SINGLE SLOPE BARRIER WALL FOR ATTACHING GUARDRAIL
S-SSMB-6B       DUAL GUARDRAIL ATTACHMENT TO SINGLE SLOPE 36” BARRIER WALL
S-SSMB-6C       SINGLE GUARDRAIL ATTACHMENT TO SINGLE SLOPE 36” BARRIER WALL
S-SSMB-6D       51” CONCRETE SINGLE SLOPE BARRIER WALL FOR ATTACHING GUARDRAIL
S-SSMB-6E       DUAL GUARDRAIL ATTACHMENT TO SINGLE SLOPE 51” BARRIER WALL
S-SSMB-6F       SINGLE GUARDRAIL ATTACHMENT TO SINGLE SLOPE 51” BARRIER WALL
  05/01/2020
FOOTING DETAILS FOR OVERHEAD SIGN STRUCTURE 32” MEDIAN BARRIER WALL
  05/01/2020
FOOTING DETAILS FOR OVERHEAD SIGN STRUCTURE 51” MEDIAN BARRIER WALL
  10/29/2021
SINGLE SLOPE BARRIER WALL FOR GRADE SEPARATED MEDIAN
S-SSMB-10 IB 24-03 01/09/2024 SPECIAL DETAIL FOR CONCRETE MEDIAN BARRIER WALL BARRIER WALL TRANSITION FROM 32” TO 51”
       

GUARDRAIL MAINTENANCE
DRAWING RELATED IB REVISION DATE DESCRIPTION
  06/15/2021 W-BEAM & THRIE BEAM BARRIER RAIL AND RUB RAIL DETAILS
S-GR28-2M
  06/28/2019
GUARDRAIL HARDWARE DETAILS
S-GR28-3M
  01/28/2022
GUARDRAIL HEIGHT ADJUSTMENT
  06/28/2019
GUARDRAIL TERMINAL ANCHOR TYPE 13
S-GR28-5M
  06/28/2019
MEDIAN DIVIDER GUARDRAIL
S-GR28-6M   10/29/2021
GUARDRAIL ATTACHMENT TO CONCRETE DECKS
S-GR28-7M
  06/28/2019
GUARDRAIL ATTACHMENT TO BRIDGE END DETAILS
S-GRC-1M     GUARDRAIL CONNECTION TO BRIDGE ENDS OR BARRIER WALL
S-GRC-2M     GUARDRAIL CONNECTION TO BRIDGE END FOR LOCAL ROADS (ADT < 2000)
S-GRC-3M     MEDIAN DIVIDER GUARDRAIL TRANSITION TO CONCRETE MEDIAN BARRIER
S-PL-2M* IB 23-04   SAFETY PLAN AT SIDE RSAFETY PLAN AT SIDE ROADS OR PRIVATE DRIVES
S-SSMB-6M     GUARDRAIL ATTACHMENT TO EXISTING SINGLE SLOPE CONCRETE BARRIER WALL
       

* NOTE: Standard drawing S-PL-2 has been renamed to S-PL-2M and has been placed under the Guardrail Maintenance Series.

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

This Page Last Updated: April 1, 2024 at 2:30 PM