The evaluation of a WIM system is the process of quantifying its performance (fitness for purpose and condition) in undertaking the application for which it was chosen.
Typical performance criteria used in the initial or ongoing evaluation and appropriateness for specific application(s) of WIM systems are:
- application – need, network or project level, low or high speed
- installation requirements – location, vehicle types to be weighed, vehicle speeds, installation duration
- ease of use – power requirements, automation, permanent, semi-permanent or temporary, conspicuity, communication capabilities, training, user manuals
- quality of data – data storage and retrieval, output data requirements and application specific reports
- calibration – initial and ongoing
- accuracy – required accuracy of data items given the application
- life span – initial and ongoing costs, durability, reliability, maintainability and reparability.
There are a number of standards available for evaluation and accuracy determination and reporting.
The evaluation criteria need to be clearly distinguished with the identified application(s) and the method to quantify and assess them defined.
ASTM 2009, Standard specification for highway weigh-in-motion (WIM) systems with user requirements and test methods, E1318-09, American Society for Testing Materials, West Conshohocken, PA, USA
Jacob, Jehaes & O'Brien 2002, E 2002, COST 323: Weigh-in-motion of road vehicles (WIM-load), final report, Laboratoire Central des Ponts et Chaussees (LCPC), Paris, France