The National Highway Traffic Safety Administration (NHTSA) has extended the public comment period by 30 days to November 21, 2026, for its Supplemental Notice of Proposed Rulemaking (SNPRM) on the advanced THOR-50M crash test dummy. This dummy represents a 50th percentile adult male and is used in frontal crash testing.

The extension comes after the Alliance for Automotive Innovation requested more time to review the over 1,700 pages of technical documents, including new spine configurations and face insert alternatives, to provide detailed feedback. Originally, comments were due by October 22, 2026.

What changes are proposed for the THOR-50M dummy?

NHTSA's SNPRM proposes a new 'four-position spine' design to allow integration of different in-dummy data acquisition systems while maintaining performance. An alternative face insert replaces the previously proposed face foam to address operational and durability concerns. A minor upper arm modification is also included.

The agency has made detailed engineering drawings, qualification procedures, and assembly instructions available for public review as part of the rulemaking process.

Why the extension matters

The Alliance for Automotive Innovation said the original 30-day comment period was insufficient given the volume and complexity of the technical materials. The extension allows manufacturers and other stakeholders more time to conduct analyses and coordinate internally to submit thorough comments.

NHTSA agreed the extension balances the need for timely feedback with providing the public adequate opportunity to engage on the proposed rule.

What it means for you

The THOR-50M dummy is a key tool in evaluating vehicle safety in frontal crashes. Updates to its design could affect how crash tests are conducted and how safety features are assessed in new vehicles.

Manufacturers and safety advocates will use this extended comment period to influence the final specifications, which could impact vehicle safety standards and regulations in the coming years.

Consumers can follow the rulemaking progress to understand how future vehicles might be tested for crashworthiness using this advanced dummy.