What are the Arkansas Temporary Precast Barrier Placement Specifications?

Tips & Advice

The Arkansas State Highway Commission outlines specifications regarding the proper placement for precast barriers, including general notes, barrier placement along a bridge with offset, placement along a road with offset, attenuator details and special end unit details.

Arkansas Temporary Precast Barrier General Notes

When shown on the Plans, the ends of the Temporary Precast Concrete Barrier should be protected with an NCHRP-350 or Manual for Assessing Safety Hardware (MASH) approved Crash Cushion. Payment for Crash Cushions shall be made under the item of "Temporary Impact Attenuation Barrier."

Barriers should be doweled to the pavement when the distance between the barrier and the nearest road edge is less than 4’-0” and the
height of the road edge “lip” is greater than 24”.

Arkansas Barrier Placement Along Bridge with Offset

Cut line: A cut line of four feet or greater is preferred. If less than 4 feet, precast units should be connected to the slab.

Special End Unit: The distance between the bridge end and the start of the special end unit should be no less than 40’.

Delineators: Delineators should be set at 10’ spacing (typ.).

Taper rate: The taper rate between the bridge end and the special end unit should be 10:1.

Offset Distance: Offset distances depend on the speed of traffic, as follows:

  • If speed is less than or equal to 45 mph, offset distance should be 12 feet

  • If speed is greater than 45 mph, offset distance should be 18 feet

  • If offset distance is not attainable, then barriers should be place with attenuators

Arkansas Barrier Placement Along Road with Offset

Taper rate: The taper rate leading up to the special end unit should be 10:1.

Special End Unit: The distance between the start of the taper and the special end unit should be no less than 40’.

Delineators: Delineators should be set at 10’ spacing (typ.).

Offset Distance: Offset distances depend on the speed of traffic, as follows:

  • If speed is less than or equal to 45 mph, offset distance should be 12 feet

  • If speed is greater than 45 mph, offset distance should be 18 feet

  • If offset distance is not attainable, then barriers should be place with attenuators

Arkansas Barrier Placement with Attenuator

Temporary impact attenuation barriers should be placed at the end of the special unit. Offset distances should be applied for two way traffic only. There should be a minimum of 3’-0” from the edge of the travel lane to the nearest edge of the attenuator.

Special End Unit Details

Each end unit should conform to the following dimensions and include the following features:

  • Height: 2’-8”

  • Top Width: 1’-0

  • Two (2) ¾” diameter steel bars space 9” apart from each other running vertically through the center of the end unit

  • 1-1/2” diameter hole for a 1” drift pin, spaced 1’-6” from the end of the unit

  • 2-#5 bars running horizontally through the unit

This blog post is an interpretation of specifications by the Arkansas Department of Transportation. Please consult with Arkansas DOT's most recent requirements for definitive information.

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