MASH Related Memos

FHWA - FAQs Guardrail Height Memo - May 17, 2010

FHWA’s Federal-aid eligibility letter for Cable Barrier systems

FHWA - Clarifications on Implementing the AASHTO 2016 Manual for Assessing Safety Hardware

May 9, 2018. This document is a compilation of all questions and answers (Q&A) that have been developed to clarify the intent of the 2016 edition of the Manual for Assessing Safety Hardware (MASH) and to apply MASH. Also, to assist manufacturers, crash test laboratories, and transportation agencies in implementing the guidelines to develop and use roadside safety devices.

FHWA - Eligibility of Crash Cushion devices MASH 16 Sunset date - December 20, 2018

FHWA - FINAL Modification to December 2018 Sunset Date for MASH Cable Barriers & Terminals - August 13, 2018.pdf

FAQ about CDOT Guardrails, Crash Cushions, and End Treatments

Issuance Letter for the Manual for Assessing Safety Hardware (MASH) Implementation Updates - April 5, 2019

Issuance Letter for M-606-1 MGS 31-inch & D-606-2 MGS 31-inch without Blocks - December 21, 2018

Issuance Letter for M-606-1 MGS 31-inch & D-606-2 MGS 31-inch without Blocks - February 8, 2018

Superseded on December 21, 2018.

Issuance Letter for M-606-15 Guardrail Type 9 Single Slope Barrier - July 16, 2018

Issuance Letter for Impact Attenuator Standard Guidelines - November 23, 2015

Archived MASH Related Memos

For Reference Purposes Only