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.
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.