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Weighing In Motion

NMi has taken the initiative to bring together a small group of experts on legal metrology and standardisation of measurement instruments with a select number of international experts on WIM to develop this new WIM standard. The members of this project group cover a broad field of expertise required to develop this practical standard, suited in structure and content to the quality required for international use. Together, the experts involved in developing this standard have a combined experience of over 100 years, covering both vendors and end-users as well as expertise on a variety of WIM technologies, systems, applications, and conditions from countries worldwide.

NMi’s WIM Standard was developed by all participating members of the expert group. The standard is open to use by both buyers and vendors of WIM systems to facilitate their collaboration. Furthermore, we encourage National Metrology Institutes or Bureaus for Weights and Measures in any country to adopt this standard as a basis for national legislation.

NMi Weighing in Motion Standard

For many years three documents, i.e., the COST-323, ASTM-E1318, and OIML-R134, have been used to determine the performance of Weigh-In-Motion (WIM) systems. Each document has its own area of use, with specific advantages and disadvantages. But none the three covers the applications and operational conditions for WIM systems in for example direct enforcement of overloading under regular highway conditions.

As a result, national authorities worldwide have to develop their own specifications and test procedures for their national legislation. This has led to a situation where there are several different national sets of requirements on WIM that are not compatible, and which are considered by many too complicated for practical use. This has resulted in unnecessary additional work and costs for both vendors and end-users of WIM systems. The NMi WIM Standard was developed to overcome these issues and covers all applications for both high (and low) speed WIM systems.

Download our NMi International WIM Standard here.

NMi Weighing in Motion Standard – Guide

The NMi WIM Standard Guide serves as a support document for the NMi WIM Standard. The document sets out the scope and application and how these are reflected in the structure of the standard. It explains the different levels of performance testing and how the various tests are used in the procedures for acceptance of WIM systems for Legal or Statistical applications. Finally, the document sets out why certain choices have been made in the development of the standard itself.

Download our NMi International WIM Standard Guide here.

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