Guardrail Post and Blocks Specifications.pdf
PDF 3 MB Posted
- Attached to
- GUARDRAIL POSTS AND BLOCKS, ANNUAL ESTIMATED QUANTITIES State and local contract opportunity
- Solicitation number
- 7267
- Issued by
- Oakland County, Michigan
About this file
This document is a standard plan from the Michigan Department of Transportation (MDOT) for various types of guardrails (Types A, B, BD, T, TD, MGS-8, and MGS-8D), dated 01/29/2024. The 16-page technical drawing provides comprehensive detailed specifications for guardrail installation, including elevation views, post spacing, beam element lengths, transition details, wood and steel post configurations, offset block designs, splice details, and guardrail reflector placement guidelines. The standard plan covers multiple guardrail types with specific dimensions for wood and steel posts, including variations for different traffic conditions, shoulder widths, and embankment slopes.
The technical drawings include precise measurements for post spacing (typically 6'-3"), beam element lengths (12'-6" effective), ground line heights, and installation requirements for different guardrail configurations. The plan provides detailed instructions for connecting different guardrail types, including transition details between standard W-beam elements and MGS (Midwest Guardrail System) elements. Additional specifications cover reflector placement, with guidelines for one-way and two-way traffic scenarios, specifying reflector intervals of 50'-0" on tangent sections and curves with a radius of 1150' or more, and 25'-0" on curves with a radius less than 1150'. The document is approved by the MDOT Director and has received FHWA approval, indicating it meets federal highway standards.
View the file
Other files for this state and local contract opportunity
| File | Type | Posted |
|---|---|---|
| 7267.pdf |
On GovTribe
Work with this file on GovTribe
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
WOOD POST STEEL POST ELEVATION SHOWING POST SPACING
GUARDRAIL, TYPE A
GROUND LINE
(TYP.)
SPLICE BOLT
6"
WOOD LINE POST
6" x 8"
(TYP.)
SPLICE BOLT
UNDER NUT
ROUND WASHER
POST BOLT WITH
8"
UNDER NUT
ROUND WASHER
POST BOLT WITH
GROUND LINE
AND TYPICAL POST SPACING
EFFECTIVE BEAM ELEMENT LENGTH
12'-6"
* SEE NOTES FOR GUARDRAIL IN CONJUNCTION WITH CURB
GROUND LINEOPTIONAL
STEEL LINE POST
W6 x 9 OR W6 x 8.5
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR
R-60-J
SHEET
16 1 OF FHWA APPROVAL
(SPECIAL DETAIL) 01/29/2024
PLAN DATE
GUARDRAIL, TYPES A, B, BD, T, TD, MGS-8, & MGS-8D
STANDARD PLAN FOR
APPROVED BY:
APPROVED BY:
DIRECTOR, BUREAU OF DEVELOPMENT
FIELD SERVICES DIRECTOR, BUREAU OF
ELEVATION SHOWING POST SPACING
GUARDRAIL, TYPE B (OR BD)
( WOOD POST )
* SEE NOTES FOR GUARDRAIL IN CONJUNCTION WITH CURB
GROUND LINE
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
POST SPACING
6'-3" TYPICAL
6" x 8" WOOD LINE POST
LINE
GROUND
HINGE POINT
SHOULDER
COATED NAIL
3" LONG HOT-DIP ZINC
WOOD POST WITH A MINIMUM
TOE NAIL WOOD BLOCK TO
SHOULDER
NORMAL
2'-0" ***
8"8"(TYP.)
SPLICE BOLT
** 5'-0" OR AS SPECIFIED ON PLANS
USE 8'-0" POST WITH THE ADDITIONAL LENGTH EMBEDDED.
THAN 2'-0" AND THE EMBANKMENT (OR MEDIAN) SLOPE IS STEEPER THAN 1:10,
IF THE OFFSET FROM THE FACE OF POST TO THE SHOULDER HINGE POINT IS LESS***
FOR PAVED SHOULDER WIDTHS OF AT LEAST 12', USE 3'-0". **
WOOD OFFSET BLOCK
6" x 8"
UNDER NUT
ROUND WASHER
POST BOLT WITH
8" 8" 8"
NAIL
HOT-DIP ZINC COATED
A MINIMUM 3" LONG
TO WOOD POST WITH
TOE NAIL WOOD BLOCK
SLOPE
(OR MEDIAN)
EMBANKMENT
TYPE BD
WASHER UNDER NUT
POST BOLT WITH ROUND
FOR TYPE BD ONLY
DOUBLE SIDED SHOWN
ELEVATION SHOWING POST SPACING
GUARDRAIL, TYPE B (OR BD)
( STEEL POST )
GROUND LINE
POST SPACING
6'-3" TYPICAL
(TYP.)
SPLICE BOLT
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
* SEE NOTES FOR GUARDRAIL IN CONJUNCTION WITH CURB
STEEL LINE POST
W6 x 9 OR W6 x 8.5
LINE
GROUND
HINGE POINT
SHOULDER
SHOULDER
NORMAL
2'-0" ***
** 5'-0" OR AS SPECIFIED ON PLANS
WASHER UNDER NUT
POST BOLT WITH ROUND
SLOPE
(OR MEDIAN)
EMBANKMENT
FOR STEEL POST
WOOD OFFSET BLOCK
ROUTED 6" x 8"
FOR TYPE BD ONLY
DOUBLE SIDED SHOWN
USE 8'-0" POST WITH THE ADDITIONAL LENGTH EMBEDDED.
THAN 2'-0" AND THE EMBANKMENT (OR MEDIAN) SLOPE IS STEEPER THAN 1:10,
IF THE OFFSET FROM THE FACE OF POST TO THE SHOULDER HINGE POINT IS LESS***
FOR PAVED SHOULDER WIDTHS OF AT LEAST 12', USE 3'-0". **
ELEMENT
BEAM
POST BOLT
FOR STEEL POST
ROUTED 6" x 8" WOOD BLOCK
2" TO 3"
"8
IN LENGTH)
OF POSTS GREATER THAN 6'-0"
BOTTOM(UP TO 4 OPTIONAL HOLES IN
" DIA. GALVANIZING HOLE(S)16
" OR 4
NUT
ROUND WASHER
STEEL LINE POST
W6 x 9 OR W6 x 8.5
(OPTIONAL)
GALVANIZING HOLE
" DIA. 16
" OR 4
2" TO 3"
"8
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 2 OF FHWA APPROVAL
TOP
SIDEFRONT
WOOD OFFSET BLOCKS FOR GUARDRAIL, TYPE B AND TYPE BD
FOR USE ON WOOD POSTS
TOP
FRONT SIDE
FOR USE ON STEEL POSTS
WOOD POST STEEL POST
BEAM ELEMENT SPLICE DETAILS
"8
STEEL POST�
POST BOLT SLOT�
"2 11'-0
2"2" "4 14"4
POST BOLT SLOT
"2
1" x 24
(TYP.)
SPLICE BOLT SLOT
"8 1 x 132
WOOD POST�
POST BOLT SLOT AND�
3"
"8
" DIA. HOLE4
"8 1±
" DIA. HOLE4
(SEE NOTES ON SHEET 16 OF 16)
6"
"4 14 3"3"
6"
"2 11'-0
2"2" "4 14"4
POST BOLT SLOT
"2
1" x 24
(TYP.)
SPLICE BOLT SLOT
"8 1 x 132
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 3 OF FHWA APPROVAL
ELEVATION SHOWING POST SPACING
GUARDRAIL, TYPE T (OR TD)
( WOOD POST )
ELEVATION SHOWING POST SPACING
GUARDRAIL, TYPE T (OR TD)
( STEEL POST )
* SEE NOTES FOR GUARDRAIL IN CONJUNCTION WITH CURB
GROUND LINE
POST SPACING
6'-3" TYPICAL
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
6" x 8" WOOD LINE POST
HINGE POINT
SHOULDER
LINE
GROUND
2'-0" ***
8"8"(TYP.)
SPLICE BOLT
SHOULDER
NORMAL
(TYP.)
SPLICE BOLT
GROUND LINE
POST SPACING
6'-3" TYPICAL
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
* SEE NOTES FOR GUARDRAIL IN CONJUNCTION WITH CURB
** 5'-0" OR AS SPECIFIED ON PLANS
STEEL LINE POST
W6 x 9 OR W6 x 8.5
FOR STEEL POST
ROUTED 6" x 8" WOOD BLOCK
ELEMENT
BEAM
(TYP.)
POST BOLT
HINGE POINT
SHOULDER
LINE
GROUND
2'-0" ***
SHOULDER
NORMAL
** 5'-0" OR AS SPECIFIED ON PLANS
WASHER UNDER NUT
POST BOLT WITH ROUND
FOR STEEL POST
WOOD OFFSET BLOCK
ROUTED 6" x 8"
SLOPE
(OR MEDIAN)
EMBANKMENT
WOOD OFFSET BLOCK
6" x 8"
UNDER NUT
ROUND WASHER
POST BOLT WITH
8" 8" 8"
SLOPE
(OR MEDIAN)
EMBANKMENT
WASHER UNDER NUT
POST BOLT WITH ROUND
FOR TYPE TD ONLY
DOUBLE SIDED SHOWN
FOR TYPE TD ONLY
DOUBLE SIDED SHOWN
TYPE TD
USE 8'-0" POST WITH THE ADDITIONAL LENGTH EMBEDDED.
THAN 2'-0" AND THE EMBANKMENT (OR MEDIAN) SLOPE IS STEEPER THAN 1:10,
IF THE OFFSET FROM THE FACE OF POST TO THE SHOULDER HINGE POINT IS LESS***
FOR PAVED SHOULDER WIDTHS OF AT LEAST 12', USE 3'-0". **
USE 8'-0" POST WITH THE ADDITIONAL LENGTH EMBEDDED.
THAN 2'-0" AND THE EMBANKMENT (OR MEDIAN) SLOPE IS STEEPER THAN 1:10,
IF THE OFFSET FROM THE FACE OF POST TO THE SHOULDER HINGE POINT IS LESS***
FOR PAVED SHOULDER WIDTHS OF AT LEAST 12', USE 3'-0". **
2" TO 3"
"8
NUT
ROUND WASHER
STEEL LINE POST
W6 x 9 OR W6 x 8.5
(OPTIONAL)
GALVANIZING HOLE
" DIA. 16
" OR 4
2" TO 3"
"8
IN LENGTH)
OF POSTS GREATER THAN 6'-0"
BOTTOM(UP TO 4 OPTIONAL HOLES IN
" DIA. GALVANIZING HOLE(S)16
13" OR 4
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 4 OF FHWA APPROVAL
BLOCK AND POST CONNECTION DETAILS
GUARDRAIL, TYPE B
GUARDRAIL, TYPE T
GUARDRAIL, TYPE B
GUARDRAIL, TYPE T
TO WOOD OFFSET BLOCK
CONNECTING STEEL POST
POST BOLT
ROUTED WOOD OFFSET BLOCK
CONNECTING STEEL POST TO
POST BOLT
WOOD POST STEEL POST
ROUTED WOOD OFFSET BLOCK
CONNECTING STEEL POST TO
POST BOLT
TO WOOD OFFSET BLOCK
CONNECTING STEEL POST
POST BOLT
WOOD POST STEEL POST
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR
R-60-J
SHEET
16 OF 5FHWA APPROVAL
TOP
SIDEFRONT
WOOD OFFSET BLOCKS FOR GUARDRAIL, TYPE T AND TYPE TD
FOR USE ON WOOD POSTS
TOP
FRONT SIDE
FOR USE ON STEEL POSTS
WOOD POST STEEL POST
THRIE BEAM ELEMENT SPLICE DETAILS
3"3"
6"6"
"4
3"
(SEE NOTES ON SHEET 16 OF 16)
"2
1'-0
2"2" "4
4"4
4 "8
STEEL POST�
"2 11'-0
2"2" "4 14"4
POST BOLT SLOT�
(TYP.)
SPLICE BOLT SLOT
"8 1 x 132
POST BOLT SLOT
"2
1" x 24
POST BOLT SLOT
"2
1" x 24
(TYP.)
SPLICE BOLT SLOT
"8 1 x 132
WOOD POST�
POST BOLT SLOT AND�
" DIA. HOLE4
3" DIA. HOLE4
"8
"8 1±
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 6FHWA APPROVAL
( STEEL POST )
6" x 8" WOOD LINE POST
LINE
GROUND
HINGE POINT
SHOULDER
SHOULDER
NORMAL
2'-8" ***
8"
** 5'-8" OR AS SPECIFIED ON PLANS
USE 9'-0" POST WITH THE ADDITIONAL LENGTH EMBEDDED.
THAN 2'-8" AND THE EMBANKMENT (OR MEDIAN) SLOPE IS STEEPER THAN 1:10,
IF THE OFFSET FROM THE FACE OF POST TO THE SHOULDER HINGE POINT IS LESS***
FOR PAVED SHOULDER WIDTHS OF AT LEAST 12', USE 3'-8". **
( WOOD POST )
8"
GUARDRAIL, TYPE MGS-8 (OR MGS-8D)
STEEL LINE POST
W6 x 9 OR W6 x 8.5
GUARDRAIL, TYPE MGS-8 (OR MGS-8D)
HINGE POINT
SHOULDER
UNDER NUT
ROUND WASHER
POST BOLT WITH
SHOULDER
NORMAL
2'-8" ***
** 5'-8" OR AS SPECIFIED ON PLANS
FOR STEEL POST
WOOD OFFSET BLOCK
ROUTED 6" x 8"
SLOPE
(OR MEDIAN)
EMBANKMENT
WOOD OFFSET BLOCK
6" x 8"
UNDER NUT
ROUND WASHER
POST BOLT WITH
8" 8" 8"
NAIL
HOT-DIP ZINC COATED
A MINIMUM 3" LONG
TO WOOD POST WITH
TOE NAIL WOOD BLOCK
SLOPE
(OR MEDIAN)
EMBANKMENT
WASHER UNDER NUT
POST BOLT WITH ROUND
NAIL
HOT-DIP ZINC COATED
A MINIMUM 3" LONG
TO WOOD POST WITH
TOE NAIL WOOD BLOCK
TYPE MGS-8D
USE 9'-0" POST WITH THE ADDITIONAL LENGTH EMBEDDED.
THAN 2'-8" AND THE EMBANKMENT (OR MEDIAN) SLOPE IS STEEPER THAN 1:10,
IF THE OFFSET FROM THE FACE OF POST TO THE SHOULDER HINGE POINT IS LESS***
FOR PAVED SHOULDER WIDTHS OF AT LEAST 12', USE 3'-8". **
TYPE MGS-8D ONLY
SHOWN FOR
DOUBLE SIDED
TYPE MGS-8D ONLY
SHOWN FOR
DOUBLE SIDED
LINE
GROUND
ELEMENT
BEAM
POST BOLT
NUT
ROUND WASHER
FOR STEEL POST
ROUTED 6" x 8" WOOD BLOCK
STEEL LINE POST
W6 x 9 OR W6 x 8.5
(OPTIONAL)
GALVANIZING HOLE
" DIA. 16
" OR 4
2" TO 3"
2" TO 3"
"8
"8
IN LENGTH)
OF POSTS GREATER THAN 6'-0"
BOTTOM(UP TO 4 OPTIONAL HOLES IN
" DIA. GALVANIZING HOLE(S)16
13" OR 4
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 7FHWA APPROVAL
ROUTED WOOD OFFSET BLOCK
CONNECTING STEEL POST TO
POST BOLT
WOOD POST STEEL POST
TO WOOD OFFSET BLOCK
CONNECTING WOOD POST
POST BOLT
"8
STEEL POST�
BLOCK AND POST CONNECTION DETAILS
TOP
SIDEFRONT
FOR USE ON WOOD POSTS
TOP
FRONT SIDE
FOR USE ON STEEL POSTS
3"3"
6"6"
"4
3"
" DIA. HOLE4
WOOD OFFSET BLOCKS FOR GUARDRAIL, TYPE MGS-8 AND TYPE MGS-8D
(SEE NOTES ON SHEET 16 OF 16)
" DIA. HOLE4
"8
"8 1±
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 8FHWA APPROVAL
6'-3" TYPICAL POST SPACING
12'-6" EFFECTIVE BEAM ELEMENT LENGTH
GROUND LINE
TOP OF RAIL
* SEE NOTES FOR GUARDRAIL IN CONJUNCTION WITH CURB
GROUND LINE
GROUND LINE
MGS POST�
MGS POST�
GUARDRAIL, TYPE MGS-8 (OR MGS-8D)
ELEVATION SHOWING POST SPACING FOR
GUARDRAIL, TYPE MGS-8 OR MGS-8D
GUARDRAIL, TYPE MGS-8 OR MGS-8D
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
BEAM ELEMENT LENGTH
" EFFECTIVE2
19'-4
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
" HEIGHT TRANSITION2
134'-4
W-BEAM ELEMENT
STANDARD (12'-6")
BEAM ELEMENT
")2
1MGS (9'-4
W-BEAM ELEMENT
STANDARD (12'-6")
BEAM ELEMENT LENGTH
" EFFECTIVE2
19'-4
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
" HEIGHT TRANSITION2
128'-1
LENGTH
EFFECTIVE
6'-3"
W-BEAM ELEMENT
STANDARD (12'-6")
BEAM ELEMENT
")2
1MGS (9'-4
POST SPACING
6'-3" TYPICAL
POST SPACING
6'-3" TYPICAL
GUARDRAIL APPROACH TERMINAL TYPE 1B, 2B, OR 3B
GUARDRAIL, TYPE B, GUARDRAIL, TYPE BD, OR
GUARDRAIL, TYPE MGS-8 (OR MGS-8D) TO
ELEVATION SHOWING TRANSITION DETAIL FOR CONNECTING
GUARDRAIL ANCHORAGE, BRIDGE DETAIL A1, T1, T4 OR T6
GUARDRAIL ANCHORAGE, MEDIAN,
GUARDRAIL, TYPE T, GUARDRAIL, TYPE TD,
GUARDRAIL, TYPE MGS-8 (OR MGS-8D) TO
ELEVATION SHOWING TRANSITION DETAIL FOR CONNECTING
GUARDRAIL POST�
GUARDRAIL POST�
TRANSITION
THRIE BEAM
SYMMETRICAL
GUARDRAIL ANCHORAGE, BRIDGE DETAIL __
GUARDRAIL ANCHORAGE, MEDIAN
GUARDRAIL, TYPE __
GUARDRAIL APPROACH TERMINAL TYPE __
GUARDRAIL, TYPE __
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 9FHWA APPROVAL
GROUND LINE
GROUND LINE
MGS POST�
MGS POST�
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
BEAM ELEMENT LENGTH
" EFFECTIVE2
19'-4
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
" HEIGHT TRANSITION2
134'-4
W-BEAM ELEMENT
STANDARD (12'-6")
BEAM ELEMENT
")2
1MGS (9'-4
W-BEAM ELEMENT
STANDARD (12'-6")
BEAM ELEMENT LENGTH
" EFFECTIVE2
19'-4
BEAM ELEMENT LENGTH
12'-6" EFFECTIVE
" HEIGHT TRANSITION2
128'-1
LENGTH
EFFECTIVE
6'-3"
POST SPACING
6'-3" TYPICAL
POST SPACING
6'-3" TYPICAL
BEAM ELEMENT
")2
1MGS (9'-4
W-BEAM ELEMENT
STANDARD (12'-6")
GUARDRAIL APPROACH TERMINAL TYPE 2M OR TYPE 3M
GUARDRAIL, TYPE B (OR TYPE BD) TO
ELEVATION SHOWING TRANSITION DETAIL FOR CONNECTING
GUARDRAIL APPROACH TERMINAL TYPE 2M OR TYPE 3M
GUARDRAIL, TYPE T (OR TYPE TD) TO
ELEVATION SHOWING TRANSITION DETAIL FOR CONNECTING
GUARDRAIL POST�
GUARDRAIL POST�
TRANSITION
THRIE BEAM
SYMMETRICAL
GUARDRAIL, TYPE B OR TYPE BD GUARDRAIL APPROACH TERMINAL TYPE 2M OR TYPE 3M
GUARDRAIL, TYPE T OR TYPE TD GUARDRAIL APPROACH TERMINAL TYPE 2M OR TYPE 3M
STANDARD PLAN R-62-SERIES
TYPE 2M SEE
STANDARD PLAN R-63-SERIES
TYPE 3M SEE
STANDARD PLAN R-62-SERIES
TYPE 2M SEE
STANDARD PLAN R-63-SERIES
TYPE 3M SEE
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 10FHWA APPROVAL
SECTION THROUGH BEAM ELEMENT
"32
"16
3 "16
"4
"8
-0 +
TOLERANCE
" R8
(TYP.)
(TYP.)
" R16
SYMMETRICAL
�ABOUT
" R16
(TYP.) N
E
U T
R A
L A
X
IS
"16
10°
BEAM ELEMENT SPLICE DETAILS
"2 11'-0
2"2" "4 14"4
(TYP.)
SPLICE BOLT SLOT
"8 1" x 132
SLOTTED HOLE�
SLOTTED HOLE
"2
1" x 24
"4 14 "4
14 2""4 14"4
142"
"2 13'-1
OF POST BOLT SLOTS�
"2 13'-1 "2
13'-1
(TYP.)
SPLICE BOLT SLOT
"8 1" x 132
(TYP.)
POST BOLT SLOT
"2 1" x 24
10'-5"
FRONT ELEVATION OF BEAM ELEMENT
"4 14 "4
14 2"
"2 113'-6
"4 14"4
142"
"2 13'-1
OF POST BOLT SLOTS�
"2 13'-1 "2
13'-1 "2 13'-1
(TYP.)
SPLICE BOLT SLOT
"8 1" x 132
(TYP.)
POST BOLT SLOT
"2 1" x 24
") BEAM ELEMENT2
1FRONT ELEVATION OF MGS (9'-4
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 11FHWA APPROVAL
SECTION THROUGH THRIE BEAM ELEMENT
(FOR GUARDRAIL, TYPE T AND TD)
"16
3 "16
"4
"8
-0 +
TOLERANCE
"32
" R16
(TYP.)
"16
10°
" R8
(TYP.)
(TYP.)
" R16
FRONT ELEVATION OF THRIE BEAM ELEMENT
"4
4 "4
4 2"
"2
13'-6
"4
4"4
42"
OF POST BOLT SLOTS�
(TYP.)
SPLICE BOLT SLOT
"8 1" x 132
(TYP.)
POST BOLT SLOT
"2 1" x 24
"2 13'-1 "2
13'-1 "2 13'-1 "2
13'-1
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR R-60-J
SHEET
16 OF 12FHWA APPROVAL
"4
4 "4
4 2""4
4"4
42"
"2
7'-3
"2
3'-1
SPLICE BOLT SLOT (TYP.)
"8
" x 132
POST BOLT SLOT (TYP.)
"2
" x 24
ASYMMETRICAL THRIE BEAM TRANSITIONS
NOTE: ASYMMETRICAL TRANSITION TYPE WILL VARY BY LOCATION DEPENDING ON GUARDRAIL LAYOUT
THRIE BEAM TRANSITION
SECTION THROUGH
THRIE BEAM TRANSITION
SECTION THROUGH
THRIE BEAM TRANSITION
SECTION THROUGH
THRIE BEAM TRANSITION
SECTION THROUGH
THRIE BEAM TRANSITION
SECTION THROUGH
THRIE BEAM TRANSITION
SECTION THROUGH
SYMMETRICAL THRIE BEAM TRANSITIONS
"2
3'-1
"4
4 "4
4 2""4
4"4
42"
"2
7'-3
"2
3'-1"2
3'-1
POST BOLT SLOT (TYP.)
"2
" x 24
SPLICE BOLT SLOT (TYP.)
"8
" x 132
"4
4 "4
4 2""4
4"4
42"
"2
7'-3
"2
3'-1"2
3'-1
SPLICE BOLT SLOT (TYP.)
"8
" x 132
POST BOLT SLOT (TYP.)
"2
" x 24
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR
R-60-J
SHEET
16 OF 13FHWA APPROVAL
TO GUARDRAIL, TYPE BD (OR TYPE TD)
DETAIL SHOWING TRANSITION FROM GUARDRAIL, TYPE B (OR TYPE T)
SPLICE BOLT AND POST BOLT
AT BEAM ELEMENT SPLICE POSTS AND AT INTERMEDIATE POSTS
POST BOLTS, SPLICE BOLTS AND WASHERS
150'
METAL TAG
ROUND WASHER NUT
STANDARD WIDTH VARIABLE WIDTH (FIELD BEND)
M
A X
OF TRAFFIC
DIRECTION
OF TRAFFIC
DIRECTION
(TWO REQUIRED FOR TYPE TD)
(ONE REQUIRED FOR TYPE BD)
POST BOLT LENGTH 2'-10"
PAY ITEM: GUARDRAIL, TYPE BD (OR TD) GUARDRAIL, TYPE B (OR T)
PAY ITEM EACH SIDE:
APPROX. 6'-3"
OFFSET BLOCKS (TYPE TD) 6" x 1'-0" x 1'-10"
OFFSET BLOCKS (TYPE BD) 6" x 1'-0" x 1'-3"
OFFSET BLOCKS (TYPE TD) 6" x 9" x 1'-10"
OFFSET BLOCKS (TYPE BD) 6" x 9" x 1'-3"
(TWO REQUIRED FOR TYPE TD)
(ONE REQUIRED FOR TYPE BD)
POST BOLT LENGTH 2'-4"
POST
BLOCK
OFFSET
POST BOLTS
NO. LENGTH
SPLICE BOLTS WASHERS
WOOD
WOOD
STEEL
STEEL
WOOD
STEEL
WOOD
STEEL
WOOD
STEEL
(ROUND)
N O
T N
E E
D E
D A
T I
N T
E R
M E
D
IA
T E
P O
S T
S
WOOD
WOOD
WOOD
WOOD
WOOD
WOOD
WOOD
WOOD
A
B
BD
T
TD
REQ'D (NO. REQ'D)(NO. REQ'D)
TYPE
GUARDRAIL
N/A
N/A
"2
"2
18"
2"
"2
"2
"2
"2
* "2
18"
" LONG)4
(1
" BEYOND NUT. 2
EXTEND MORE THAN
(OR TYPE T) TO GUARDRAIL, TYPE BD (OR TYPE TD). POST BOLTS SHALL NOT
* EXCEPT AS SPECIFIED ON DETAIL SHOWING TRANSITION FROM GUARDRAIL, TYPE B
AND 8 ON TYPE B END).
THRIE BEAM TRANSITIONS REQUIRE 20 SPLICE BOLTS EACH (12 0N TYPE T END
" (SPLICE BOLT)4
SEE CHART (POST BOLT)
"32
"16
1 - "
"8
RECESS ONE OR BOTH SIDES
" DEEP16
" DIA. x 16
"64
" DIAMETER4
" DIAMETER16
"4
1 "16
0.012" THICK
" DIA. HOLE4
1" 3"
"8
4" ±
METAL TAG
" HIGH ON THE 4
EMBOSSED
CURVED GUARDRAIL RADIUS
FOR CURVED GUARDRAIL WITH RADIUS OF 150' OR LESS
"16
" OR 116
CLIPPED HEAD OPTIONAL
MINIMUM POST BOLT THREAD LENGTH
BOLT LENGTH MINIMUM THREAD LENGTH
18"
"2
26 3"
"2
9 "4
"2
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR
R-60-J
SHEET
16 OF 14FHWA APPROVAL
MINIMUM POST BOLT THREAD LENGTH
AT BEAM ELEMENT SPLICE POSTS AND AT INTERMEDIATE POSTS
POST BOLTS, SPLICE BOLTS AND WASHERS
STANDARD WIDTH VARIABLE WIDTH (FIELD BEND)
M
A X
OF TRAFFIC
DIRECTION
OF TRAFFIC
DIRECTION
APPROX. 6'-3"
BOLT LENGTH MINIMUM THREAD LENGTH
18"
"2
26 3"
"2
9 "4
"2
POST
BLOCK
OFFSET
POST BOLTS
NO. LENGTH
SPLICE BOLTS WASHERS
(ROUND)
REQ'D (NO. REQ'D)(NO. REQ'D)
TYPE
GUARDRAIL
" LONG)4
(1
WOOD
STEEL
WOOD
WOOD
* "2
"2
MGS-8D
WOOD
STEEL
WOOD
WOOD
"2
18"
MGS-8
PAY ITEM: GUARDRAIL, TYPE MGS-8D
GUARDRAIL, TYPE MGS-8 TO GUARDRAIL, TYPE MGS-8D
DETAIL SHOWING TRANSITION FROM
OFFSET BLOCKS (TYPE MGS-8D) 6" x 1'-0" x 1'-2"
OFFSET BLOCKS (TYPE MGS-8D) 6" x 9" x 1'-2"
2'-4" FOR TYPE MGS-8D
POST BOLT LENGTH
2'-10" FOR TYPE MGS-8D
POST BOLT LENGTH
GUARDRAIL, TYPE MGS-8
PAY ITEM EACH SIDE:
NUT.
" BEYOND 2
TO GUARDRAIL, TYPE MGS-8D POST BOLTS SHALL NOT EXTEND MORE THAN
* EXCEPT AS SPECIFIED ON DETAIL SHOWING TRANSITION FROM GUARDRAIL, TYPE MGS-8
ON TYPE MGS END).
THRIE BEAM TRANSITIONS REQUIRE 20 SPLICE BOLTS EACH (12 0N TYPE T END AND 8
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR
R-60-J
SHEET
16 OF 15FHWA APPROVAL
OF TRAFFIC
DIRECTION
PLACEMENT OF GUARDRAIL REFLECTORS
ONE-WAY TRAFFIC
TWO-WAY TRAFFIC
GUARDRAIL
NOTES GOVERNING THE USE OF GUARDRAIL REFLECTORS
GUARDRAIL REFLECTOR
DIRECTION OF RAIL LAP
TWO-WAY TRAFFIC
ONE-WAY TRAFFIC
3"
2"
(TYP.)
REFLECTORIZED SIDE FACING TRAFFIC
13 GAGE GALVANIZED
(0.0934") NOMINAL
"4
" R4
96° ± 4°
OF TRAFFIC
DIRECTION
OF TRAFFIC
DIRECTION
OF TRAFFIC
DIRECTION
OF TRAFFIC
DIRECTION
TRAFFIC
SURFACE FACING
REFLECTORIZED GUARDRAILSEE NOTES BELOW
OF TRAFFIC
DIRECTION
GUARDRAIL
SEE NOTES BELOW
ADJACENT GUARDRAIL POSTS
IN OPPOSITE DIRECTIONS ON
PLACE GUARDRAIL REFLECTORS
OF TRAFFIC
DIRECTION
OF TRAFFIC
DIRECTION
GUARDRAIL
HEIGHT AND COMPATIBILITY WITH POST HOLES.
THE POST BOLT HOLES SHALL BE LOCATED TO ENSURE PROPER RAIL
DEPTH OF THE BLOCK SHALL BE AS SPECIFIED ON THIS STANDARD AND
BEVELS SPECIFIED. THE LENGTH (FRONT AND BACK FACE), WIDTH AND
A 1" BEVELED TOP MAY BE USED IN LIEU OF WOOD BLOCKS WITHOUT
" BEVELS AT THE TOP AND BOTTOM OR2
WOOD OFFSET BLOCKS WITH
HEIGHT.
THE POST BOLT HOLES SHALL BE LOCATED TO ENSURE PROPER RAIL
DEPTH OF THE POST SHALL BE AS SPECIFIED ON THIS STANDARD AND
WOOD POSTS WITHOUT BEVELS SPECIFIED. THE LENGTH, WIDTH AND
" BEVELS AT THE TOP MAY BE USED IN LIEU OF 2
WOOD POSTS WITH
BENT SECTION WILL BE REQUIRED FOR EACH CURVED ELEMENT.
150' OR LESS. A TAG IDENTIFYING THE CURVATURE OF THE SHOP
BEAM ELEMENTS SHALL BE SHOP BENT TO PLAN RADIUS FOR CURVE RADII
GUARDRAIL.
SHOULD BE MEASURED FROM THE GROUND JUST IN FRONT OF THE
THE GUARDRAIL PANEL IS LOCATED BEHIND THE CURB THE RAIL HEIGHT
CLOSEST TO THE EDGE OF THE TRAVELED LANE. WHEN THE FACE OF
GUTTER PAN, WHICH IS THE POINT ON THE GUTTER PAN THAT IS
THE RAIL HEIGHT SHOULD BE MEASURED FROM THE FRONT EDGE OF THE
WHEN THE FACE OF GUARDRAIL IS PLACED FLUSH WITH FACE OF CURB,
GUIDE TO STANDARDIZED HIGHWAY BARRIER HARDWARE."
AGC-ARTBA JOINT COMMITTEE, TASK FORCE 13 PUBLICATION TITLED "A
DETAILS SPECIFIED ON THIS STANDARD ARE ACCORDING TO THE AASHTO-
NOTES:
ANCHORAGE, BRIDGE.
DEPARTING TERMINALS AND STANDARD PLAN R-67-SERIES FOR GUARDRAIL
APPROACH TERMINALS, STANDARD PLAN R-66-SERIES FOR GUARDRAIL
SEE STANDARD PLAN R-62-SERIES OR R-63-SERIES FOR GUARDRAIL
GUARDRAIL RUNS, REGARDLESS OF ROADWAY LIGHTING.
GUARDRAIL REFLECTORS SHALL BE USED ON ALL STANDARD 1.
TERMINAL STANDARD PLAN.
TERMINALS, SEE THE APPROPRIATE GUARDRAIL APPROACH
FOR GUARDRAIL REFLECTOR PLACEMENT ON APPROACH 3.
POST FROM THE GUARDRAIL DEPARTING TERMINAL.
A GUARDRAIL REFLECTOR IS TO BE PLACED ON THE SECOND 4.
ARE TO BE PLACED ON THE UPPER POST BOLT.
ON GUARDRAIL, TYPE T AND TYPE TD GUARDRAIL REFLECTORS 5.
GUARDRAIL REFLECTORS SHALL MATCH COLOR OF EDGE LINE.6.
25'-0" ON CURVES WITH A RADIUS LESS THAN 1150'.b)
OF 1150' OR MORE.
50'-0" ON TANGENT SECTIONS AND CURVES WITH A RADIUS a)
INTERVALS:
GUARDRAIL REFLECTORS ARE TO BE SPACED AT THE FOLLOWING 2.
Michigan Department of Transportation
BRADLEY C. WIEFERICH, PE
DEPARTMENT DIRECTOR
R-60-J
SHEET
16 OF 16FHWA APPROVAL
File details come from the government source that posted it. Updated .