Manual for Assessing Safety Hardware (MASH) Transition
In issuing Federal-aid eligibility letters for roadside safety hardware, the Federal Highway Administration (FHWA) currently makes determinations of continued eligibility for modifications to devices tested to the National Cooperative Highway Research Program Report 350 (NCHRP 350). In an effort to facilitate the implementation of the Manual for Assessing Safety Hardware (MASH), FHWA intends to discontinue issuing eligibility letters for requests received after December 31, 2015, for modified NCHRP 350-tested devices that do not involve full scale crash testing to the MASH. Modifications to NCHRP 350-tested devices that have, in the past, been based on engineering analysis or finite element modeling will no longer receive FHWA eligibility letters. Effective January 1, 2016, all changes to NCHRP 350-tested devices will require testing under MASH in order to receive a Federal-aid eligibility letter from FHWA.