What are Alabama MASH, TL-3 Precast Concrete Barrier, J-J Hook (F-Shape) Portable Design Requirements?

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The Alabama Department of Transportation outlines specifications regarding the proper dimensions for F-shape barriers, including general notes, elevation view specifications, end view specifications, reflector details, J-J hook details, and more.

Alabama F-Shape Barrier General Notes

  1. J-J hook barrier, MASH test level III is approved for 12 foot lengths. Barriers should be cast and installed in accordance with the manufacturer’s recommendation.

  2. Barriers should be self-aligning with no loose hardware.

  3. Tolerance:

a. Connector location: plus or minus 1/6”

b. Connector plate size: plus or minus 1/8”

c. Barrier length: plus or minus ¼”

  1. Fluorescent reflectors should be attached tot eh top of the barrier at intervals not greater than 40 feet in longitudinal sections and 20 feet in tapered sections. The reflector color should match the adjacent traffic stripe color. The reflectors should be mounted approximately two inches above the top of the barrier and should be attached to the barrier with adhesive or by a drilled-in anchor type device. If the barriers are used in a two-way traffic situation, then the reflectors should be installed for both directions of traffic. Cost of the reflectors and mounts should be a subsidiary obligation of the concrete barrier, Type 6.

Alabama F-Shape Barrier Elevation View Specifications

F-shape barriers in Alabama should conform to the following dimensions and include the following features, according to the ALDOT elevation view specifications:

  • Length: 10’

  • Height: 2’-8”

  • A 6x6 1’-6” wide x 11’-8” center mesh installed over the length of the barrier

  • 3” between the top of the mesh and the top of the panel

  • (4) #5 x 11’-7/8” ASTM A706 rebar should be welded to the J-hook connector plates

  • 10” between the ground line and the first J-hook connector plates

  • 1’-6” between the lower and upper J-hook connector plates

  • 4” between the upper J-hook connector plate and the top of the panel

  • Two lifting slots, each 1’-3” long, set 2’-0” apart from each other and 3’-9” from each end of the barrier

  • A drainage slot running along the bottom length of the barrier

Alabama F-Shape Barrier End View Specifications

Barriers in Alabama should conform to the following dimensions and include the following features, according to the ALDOT end view specifications:

  • Height: 2’-8”

  • Bottom length: 2’-0”

  • Top length: 9”

  • Vertical reveal: 3”

  • Break point: 10” from ground line

  • Height of top slope: 1’-10”

Alabama F-Shape Barrier Reflector Details

F-shape barrier reflectors should conform to the following dimensions: 6” long, 6” high and positioned 2” from the top of the barrier.
Alabama F-Shape Barrier J-J Hook Connector Plate Details
Positive connectors, J-J hooks and connector plates should conform to the following dimensions and include the following features:

  • Bars made of 4-#5 ASTM A-706 Grade 60 bars

  • J-J hooks and connector plates set inside 2 x 2 x 3/16 angle

  • 12” mill stock with factory rolled edge; no shear cut; flame or laser cut on the sides

  • 3/8” connector plates that are 18” long

  • 1-1/2” weld on both sides of rebar (typical top and bottom bar 3/16” minimum weld size)

  • Rebar placement at plus or minus ¼” for hook assembly only

  • Connector plate should be cut from 1’-6” x 10’-0” wide strips ripped from 3/8” x 5’-0” x 10’-0” A36 plate steel

  • Prepare 10’ long edges for bending per ASTM specifications

Alabama F-Shape Barrier Rotation and Separation Details

When in an open position, there should be no more than 1-1/2” separation between the barriers.

When rotated, the gap should be 3” and 4”, and the minimum horizontal radius due to vertical rotation should be 7 degrees.

*Please note that this blog post is an interpretation of Alabama Department of Transportation's specifications. Please consult with Alabama DOT's most recent requirements for definitive information.

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