European norm EN 1317 as the most stringent criteria predicts level (degree) to keep H4b. Protective fencing system independently, whether it is a concrete, steel, wooden protective fence in the second, it must withstand impact and penetration tug of 38 tonnes, at speeds hitting 65 km / h in the incident angle of 20 °. The same fence, also needs to protect passengers in a car of 900kg at the speed of 100 km / h and the incident angle of 20 °. Since the highway is not usually only straight corridor, Usaully highway and bridges, viaducts are near the satlemnts, sometimes needs to be provided protection from penetration of the 38 tons tugs on those shares.

The system for maintaining the bridge of prefabricated concrete safety barriers, allows the highest security detention H4b, proven to reduce the load on the edge of the bridge construction hats in the event of impact by approximately 2 / 3, and at the same time supporting structure and the edge of the bridge or viaduct crown remain after the impact of the tug 38 t undamaged. The system for protection from noise (sound barrier) on motorways and fast roads with simultaneous absorption of noise by using materials that can absorb on the surface offer provides the greatest degree of containment H4b.