NCHRP 350 to MASH - Trinity Highway

MASH...WE'RE READY WHEN YOU ARE.

In 2009, AASHTO introduced new testing criteria for roadside hardware with the Manual for Assessing Safety Hardware (MASH). MASH provides

testing guidelines like 350, but takes today’s vehicle fleet and road designs into consideration. Trinity Highway is Ahead of the Curve^® actively

developing new products to the MASH testing standards. Offering numerous roadside solutions, Trinity Highway fully supports the

AASHTO/FHWA agreement to transition to MASH.

Trinity Highway MASH Products

ALL MASH PRODUCTS

SIGNIFICANT CHANGES BETWEEN NCHRP 350 & MASH

	TOPIC		NCHRP 350		MASH
	Small car test vehicle		820C vehicle (1,800 lbs.)		1100C vehicle (2,420 lbs.)
	Small car impact angle		20 degrees		25 degrees
	Light truck test vehicle		2000P vehicle (4,400 lbs.)		2270P vehicle (5,000 lbs.)
	Gating terminals and crash cushion impact angle		15 degrees		5 degrees
	Variable message signs and arrow board trailers		No mention		Added to TMA crash test matrix
	Support structure and work zone traffic control device testing		Only small car tested		Small car and light truck tested
	Windshield damage criteria		Subjective/Qualitative		Objective/Quantitative
	Vehicle rebound in crash cushion tests		None		Required

FHWA Roadside Hardware Policy and Guidance

STATUS OF AASHTO MASH IMPLEMENTATION

DECEMBER 31, 2017

In Place
Expected by a later date

W-BEAM GUARDRAIL
PERMANENT CONCRETE BARRIERS

JUNE 30, 2018

In Place
Expected by a later date

W-BEAM END TERMINALS

DECEMBER 31, 2018

In Place
Expected by a later date

CABLE BARRIERS, CABLE TERMINALS, AND CRASH CUSHIONS

DECEMBER 31, 2019

In Place
Expected by date
Expected by a later date

BRIDGE RAILS, TRANSITIONS, SIGN SUPPORTS, TEMPORARY WORK ZONE DEVICES, ALL OTHER BREAKAWAY HARDWARE, ETC.

Status of AASHTO MASH Implementation