Attenuator: FHWA Approval Letters

NCHRP Report 350 recommends two required (tests 3-50 and 3-51) and two optional (tests 3-51 and 3-52) tests for evaluation of a TMA. Approval of the TTMA-100 was granted by the Federal Highway Administration (FHWA) after the successful conduct of the two required crash tests (letter CC-90). Subsequent to the completion of the optional crash tests, a supplement to the original approval (letter CC-90a) was issued by FHWA. Copies of the two FHWA approval letters are provided.

More Information

NOTE: You should use the latest version of the Adobe Reader. Click here to go to the Adobe Reader download site.

Required (PDF file, 694 KB, opens in separate window or tab)
Optional (PDF file, 1.1 MB, opens in separate window or tab)