Direct enforcement of overload by WIM

Heavy commercial vehicle overloads contribute to deterioration of infrastructure and increase road unsafety and unfair competition between transport modes and operators. An efficient enforcement system of weights and dimensions at an affordable cost is therefore required. A large scale project was launched by the French Ministry of Transport in 2014 in France, led by IFSTTAR, in cooperation with the Cerema, to demonstrate the feasibility of using high speed weigh-in-motion (HS-WIM) systems for direct enforcement of overloads. This ambitious challenge requires overcoming technological and metrological gaps, and modifying the current legislation. The required tolerances are ±5% for the gross vehicle weight, and ±10% for axle loads for 100% of the vehicles. The methodology is to develop sorting criteria and algorithms, eliminating the outliers, that is to say the weighing data outside these tolerances. The project organization and management is described and the first results are presented in this paper.