Abstract: An alert system for warning road users in a road section. A receiver unit receives movement data of detected road users (DRUs) in relation to the road section. A memory unit has prediction modules with decreasing prediction qualities. A first prediction module makes at least one DRU position prediction if first conditions are satisfied. The second prediction module makes at least one DRU position prediction if the first conditions are not satisfied and second conditions are satisfied. The third prediction module makes at least one DRU position prediction if the first and second conditions are not satisfied. A test module tests whether the first, second, or third conditions are satisfied in relation to the road section and the DRU and selects the prediction module with the highest prediction quality with a satisfied condition. A processor predicts at least a future position of the DRUs using the selected prediction module.