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Washington, DC 20590
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FHWA Home / Safety / Roadway Departure / Sign Support, Mailboxes & Delineators

Sign Support, Mailboxes & Delineators

This listing contains breakaway sign supports, mailboxes, and delineators that have been issued an Eligibility Letter by FHWA based on AASHTO MASH criteria. The FHWA's Federal-aid eligibility letters are provided as a service to the States and are not a requirement for roadside safety hardware to be eligible for Federal-aid reimbursement. As stated in our eligibility letters, "eligibility for reimbursement under the Federal-aid highway program does not establish approval, certification or endorsement of the device for any particular purpose or use." It is the responsibility of the agency who owns the facility to determine whether or not to use a particular hardware device and how to use it for the particular situation. See AASHTO's Manual for Assessing Safety Hardware for guidance on selecting the appropriate Test Level (TL) based on traffic using the facility.

ARCHIVED: FHWA Eligibility letters issued using NCHRP 350 testing criteria.

  • Select "MASH 16" for crashworthy systems per the AASHTO Manual for Assessing Safety Hardware, 2009 Edition.
  • Select "MASH 09" for crashworthy systems per the AASHTO Manual for Assessing Safety Hardware MASH 09
  • Select "All" for both "MASH" and "MASH09".

Recently posted Eligibility Letters are marked with an asterisk (*).

Revised, October 2, 2018




Code Date MASH Manufacturer Device Description View PDF Text Version
SS-182* 2/9/2017 MASH Xcessories Squared MASSH-400 Breakaway Slip Base System for Square Steel Tube Sign Support View PDF eligibility letter on MASSH-400 	Breakaway Slip Base System for Square Steel Tube Sign Support (PDF, 5.75 MB). (5.75 MB) View Text eligibility letter on MASSH-400 	Breakaway Slip Base System for Square Steel Tube Sign Support.
SS-180 4/15/2016 MASH Xcessories SQUARED MASSH-400 Sign Support View PDF eligibility letter on MASSH-400 Sign Support (PDF, 1.41 MB). (1.41 MB) View Text eligibility letter on MASSH-400 Sign Support.
SS-166 12/7/2010 MASH North Texas Tollway Authority NTTA Short Sign Support View PDF eligibility letter on NTTA Short Sign Support (PDF, 282 KB). (282 KB) View Text eligibility letter on NTTA Short Sign Support.

Page last modified on October 2, 2018
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Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000