Weigh-In-Motion Standards

In the table below more information can be found on international standards and specifications for WIM systems  The first two, among others, specify  requirements for the road condition at the location of the WIM system, which may be used instead of the values recommended in this document.

ASTM E1318-09American Society for Testing and Materials (ASTM); Standard Specification for Highway Weigh-In-Motion (WIM) Systems with User Requirements and Test Methods, ASTM International, West Conshohocken, PA, 2017.
COST-323European Cooperation in Science and Technology (COST) Transport Action ‘WIM Load’; European Specification on Weigh-In-Motion of Road Vehicles, Version 3.0, COST-323, 1999, Cost Transport, EC/DGVII.
NMi WIMNederlands Meetinstituut (NMi); NMi WIM Standard, Specifications and test procedures for Weigh-in-Motion Systems, NMi Certin, Dordrecht, Netherlands, 2016.
OIML R134International Organiszation of Legal Metrology (OIML); International Recommendation: Automatic instruments for weighing road vehicles in motion and measuring axle loads, Part 1: Metrological and technical requirements – Test, OIML R134-1 (2006),

All specifications have been used extensively over the past years to determine the performance of WIM systems globally. They have their specific advantages, applications and scopes, e.g. some do not cover four areas of Weigh-In-Motion measurements:

  • High Speed (under free flow conditions), where the influence of vehicle dynamics plays a major role;
  • Low Speed (in a controlled environment), where the vehicle dynamics may be neglected;
  • Statistical applications (pavement and traffic loading, pre-selection for weight enforcement) where the average measurement error is relevant but accuracy of each individual measurement is less important;
  • Legal purposes (direct weight enforcement and tolling by weight), where the accuracy of each individual measurement is crucial and formal certification is required for legal acceptance.