OIML R91:2025 — What the Revision Means for Traffic Speed Meter Certification

The publication of OIML R91:2025 “Traffic Speed Meters” introduces the first fundamental revision of this Recommendation in more than 30 years.

This update reflects today’s measurement technologies — but it also changes how conformity, testing and documentation are interpreted.

For manufacturers and mobility technology providers, the question is no longer whether R91 applies, but how it influences how approvals are assessed, and how quickly products can enter the market.

A Structural Update — Not a Cosmetic One

The 2025 edition expands the scope beyond radar-based systems and modernises performance, testing and reporting requirements.

The revision introduces:

• Technology-neutral applicability
• Updated metrological performance criteria
• Standardised testing procedures
• Structured reporting templates

On paper, this appears straightforward.

In practice, the implications are less obvious.

Where Complexity Begins

The 2024 revisions introduced several important updates that manufacturers need to be aware of. While the details are highly technical, they broadly impact three areas:

1. Existing Approvals: If your device was evaluated under the previous edition, alignment with R91:2025 is not automatic.
   The critical question becomes:Which elements require revalidation?What constitutes “equivalent evidence”?When might authorities expect alignment?These answers depend on interpretation — not just text.
2. Testing & Documentation Strategy: The structured reporting format increases transparency. It also increases visibility of documentation gaps. Manufacturers may need to reconsider:Test coverage assumptionsSoftware-related documentation depthEvidence traceabilityThe earlier this is assessed, the more manageable the transition.
3. Multi-Market DeploymentWhere devices are placed across multiple jurisdictions, consistency in type evaluation documentation becomes strategically important. The revision may support harmonisation — but only if certification planning anticipates differing national interpretations.

The Strategic Risk of Waiting

Regulatory revisions rarely create immediate disruption. Instead, they shift expectations gradually. Procurement criteria are updated, evaluation bodies adjust review depth, and tender requirements begin to reference the latest edition. Organisations that assess the impact too late often face compressed evaluation timelines and reactive documentation adjustments.

The Key Question for Mobility Stakeholders 

R91:2025 is published. 

What remains unclear for many organisations is: 

• Does our current approval strategy remain robust? 

• Should we plan transitional testing? 

• How will enforcement authorities interpret the revision in practice? 

• Where are the highest-risk areas during evaluation? 

These are not theoretical questions. They directly influence development timelines and market access confidence.

Join Our Expert Session on OIML R91:2025

To address these practical implications, NMi will host a focused expert webinar examining: 

✔ How the revision is likely to be interpreted in type evaluation 

✔ What manufacturers should assess immediately 

✔ Where documentation gaps commonly arise 

✔ Strategic considerations for multi-market deployment 

✔ How to plan a structured transition 

This session is designed to move beyond “what changed”
and focus on what you should do next. 

Secure your place in the upcoming R91:2025 webinar