System for automatic detection and weighing of vehicles in motion. The system utilizes a special arrangement of sensors (inductive loops, pressure sensors) installed in the road surface. This arrangement is designed in such a way that vehicles can be weighed without the need to stop or slow down – they can travel at normal driving speed. As a result, the system can be installed on public roads and is capable of monitoring the weight of each passing vehicle. Depending on the sensor setup, the weighing accuracy ranges from ±10% (WIM-S/statistics), ±7% (WIM-P/preselection), to ±5% (WIM-E/enforcement).