The National Highway Traffic Safety Administration (NHTSA) have published a Notice of Proposed Rulemaking (NPRM) in the Federal Register that proposes to align FMVSS 205 with the Global Technical Regulation (GTR) that was published under the UNECE 1998 Agreement.
The main purpose of the GTR was to align the glazing optical, mechanical and environmental resistance requirements that existed in the US, ECE and Japan as they are all substantially similar. This will assist manufacturers in designing and testing glazing components that are acceptable in the major markets.
FMVSS 205 is a short standard as the main requirements from ANSI Z26.1 are incorporated by reference. This NPRM would contain all the text from the GTR, removing the reference.
While all the mechanical, optic and environmental tests are updated with minor amendments, NHTSA believe that the main advantage to adopting the requirements are an upgraded fragmentation test designed to better test the tempering of curved tempered glass, and a new procedure for testing an optical property of the windshield at the angle of installation, to better reflect real world driving conditions.
NHTSA propose a compliance date of 1 year after the publication of the Final Rule as the changes are minor and they believe that manufacturers will be able to comply with current systems.
Comments are due in the docket (NHTSA-2012-0083) by 20th August 2012.