Skip Top Navigation

Type 31 Beam Guardrail Terminals and Anchors

General Information
Buried terminals, non-flared terminals and flared terminals are available for use with existing runs of Type 31 beam guardrail that require modification. The Buried terminal is the preferred terminal. A flared terminal can be used where a buried terminal cannot be installed. These terminals are flared away from the traveled way which creates an offset from the tangent guardrail. A non-flared terminal is another option.

On January 6, 2017, an amendment was issued requiring that Type 31 non-flared guardrail terminals be MASH-compliant. Buried terminals are not yet required to be MASH complaint.

Identifying the different guardrail terminals
The graphics below show terminals used by WSDOT over the years. Some are no longer used, and some new terminals are not shown.

TerminalsTerminals


Type 31 Buried Terminal
Buried terminal is the preferred terminal for Type 31 beam guardrail because it eliminates the exposed end of the guardrail. The guardrail is anchored in a backslope that is 1V:3H or steeper and at least 4 feet in height.

Buried Terminal Type 2 is used when the foreslope is as steep as 1V:4H. A more abrupt flare is acceptable after the rail passed the bottom of the ditch. The height of the guardrail is maintained relative to the roadway and a rubrail is used along the exposed portion of the posts.  Standard Plan C-22.16


Buried Terminal Type 2        


Type 31 Non-flared Terminal
As of January 6, 2017, Type 31 beam guardrail non-flared terminals are required to be MASH compliant.  The following MASH compliant Type 31 beam guardrail terminals are currently listed on the Qualified Products List (QPL):

  • MSKT-SP-MGS (TL-3) - Use for all posted speeds
  • MSKT-SP-MGS (TL-2) - Use when posted speed is 45mph or less
  • SoftStop (TL-3) - Use for all posted speeds
  • Softstop (TL-2) - Use when posted speed is 45 mph or less

The Standard Plans identify proprietary non-flared terminal designs.  The Standard Plans do not show all of the details needed to construct these terminals. The Standard Plans supplement the manufacturers drawings which can be downloaded below. 

Manufacturer's Drawings
For use with 31 inch systems:

The SoftStop and the MSKT-SP-MGS are only supplied with steel posts, but can be used with wood post or steel post guardrail runs.

Older Type 31 guardrail non-flared terminals – NCHRP 350 compliant
The table below is provided for projects let prior to the amendment. These projects would generally require NCHRP 350 compliant non-flared Type 31 terminals.

TYPE

MODEL

MANUFACTURER'S DRAWINGS

NOTES

Non-flared Terminals

SKT-SP-MGS
(TL-3) (Road Systems Inc.)

SKT-SP-MGS (TL-3) (pdf, 118 kb)

Acceptable for use for all posted speeds. Steel post system

SKT-SP-MGS
(TL-2) (Road Systems Inc.)

SKT-SP-MGS(TL-2) (pdf, 77 kb)

Use for posted speeds of 45 mph or below. Steel post system

SKT-MGS
(TL-3) (Road Systems Inc.)

SKT-MGS (TL-3) (pdf, 78 kb)

Acceptable for use for all posted speeds. Wood post system


Type 31 Flared Terminal
A flared terminal can be used where a buried terminal cannot be installed. These terminals are flared away from the traveled way which creates an offset from the tangent guardrail.
 

As of January 6, 2017, there are no approved Type 31 flared guardrail terminals.


Type 31 Anchors
A guardrail anchor is needed at the end of a run of guardrail to develop tensile strength throughout its length.

 

Roadside Safety Contact
Jeff Petterson, PE
Roadside Safety Engineer
Phone: 360-705-7246
Fax: 360-705-6815