ConnDOT: Connecticut Impact Attenuation System

FHWA approves NCIAS as NCHRP Report 350 TL-3 Crash Cushion Approved: March 26, 1999	{ncias} CIAS installation in Connecticut on Route I-84 at Exit 28
The Federal Highway Administration (FHWA) has approved the Narrow Connecticut Impact Attenuation System (NCIAS) for use on the National Highway System at locations where reverse-direction impacts are unlikely. The FHWA approval letter is linked to this Web page for viewing. The ConnDOT crash test program report on the NCIAS is linked to this Web page for viewing.	{NCIAS new installation in New Zealand} NCIAS installation in New Zealand.

The NCIAS consists of eight (8) steel cylinders in a single row with two anchored wire ropes along each side. All cylinders are 3 feet (900 mm) in diameter and 4 feet (1200 mm) tall. Wall thicknesses vary from 1/8th inch (3.2 mm) to 5/8th inch (15.875 mm).

The highway safety device meets the "Test Level 3" performance requirements for redirective non-gating crash cushions, which were established by the Transportation Research Board [National Research Council] through the National Cooperative Highway Research Program, NCHRP Report No. 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features".

Downloadable Plan Sheets for NCIAS

Adobe Portable Document Format (PDF)	Microstation Design File Format (DGN)
{Adobe PDF of CIAS shop fabrication details}
cylinder fabrication details sheet 1 PDF	cylinder fabrication details sheet1 DGN
{Adobe PDF of CIAS pad and backup wall details}
cylinder fabrication details sheet 2 PDF	cylinder fabrication details sheet 2 DGN
{Adobe PDF of CIAS backup wall and assembly details}
base component details PDF	base component details DGN
{Adobe PDF of CIAS fabric cover fabrication and attachment details}
backup structure and wire ropes PDF	backup structure and wire ropes DGN
{Adobe PDF of CIAS fabric cover fabrication and attachment details}
fabric cover fabrication and attachment details PDF	fabric cover fabrication and attachment details DGN
{Adobe PDF of CIAS fabric cover fabrication and attachment details}
concrete barrier curb end treatment details PDF	concrete barrier curb end treatment details DGN
{Adobe PDF of CIAS rear transition details}
concrete pad details PDF	concrete pad details DGN

The Department Contact for the research project, "'350' Crash Testing of Connecticut Impact Attenuation Systems" is Ms. Dionysia Oliveira [dionysia.oliveira@po.state.ct.us, Telephone: (860) 258-0306; Facsimile: (860) 258-0399]. This research was conducted in cooperation with the Federal Highway Administration.