{line}

FHWA approves Connecticut Truck Mounted Attenuator as NCHRP Report 350 TL-2 Truck Mounted Attenuator Originally approved under NCHRP 230 in the mid 1970's. Approved under NCHRP 350 on July 13, 1995.  Free downloadable plans below.

{CTMA as seen from the rear by motorists} CTMA In-house fabrication and repair of this highway safety system have saved taxpayers an estimated $1.3M versus commercially-available truck mounted attenuators.  The CTMA's have been in service protecting workers since the 1970's when the CTMA was first approved for use on the National Highway System.  Today, one-hundred thirty-four (134) CTMA units are in service on Connecticut highways. Repair History for period 1999 to 2002

The Federal Highway Administration (FHWA) has approved the Connecticut Truck Mounted Attenuator (CTMA) for use on the National Highway System. The July 13, 1995 FHWA approval letter is linked to this Web page. The ConnDOT crash test program report on the CTMA is linked to this Web page for viewing.

The CTMA consists of four 24-inch (610-mm) diameter steel cylinders supported between a steel guide frame that attaches to a shadow truck, and an aluminum impact plate assembly with aluminum channels that slide into steel tubes in the guide frame during impact.  The steel cylinders are A53 Grade B seamless steel pipe (API 5L steel pipe - oil and gas transmission line pipe, water pipe and water well casing.).  Three cylinders have 1/4-inch wall thickness and the fourth has 3/8th0inch wall thickness.

-