The testing methods are precisely defined in the EN 1317 and SANS 51317-2 in order to be able to compare restraint systems of both various types of construction and those of various materials. After positive testing, each product can be described with few code numbers. These basically consist of:

  • the containment level (e.g. H4b)
  • the working width (e.g. W6)
  • the Impact Severity Level ASI (e.g. ASI B)

These three values enable to distinguish between steel guardrails, local- and prefabricated concrete safety barriers independently of their style of construction. Thus it is easier to estimate their reaction in case of impact.

After more than 100 positive crash tests and after having been present on European roads for decades.

Crash Test Statistics

DB80 crash test results

High safety for car occupants

DELTA BLOC® is a flexible traffic safety system. As a rule the elements are loosely set up on the subsoil and are connected to each other with the patented coupling. Thus the complete safety barrier is considerably restricted to displacement. In case of impact it comes to a reduction of energy due to vehicle’s stepping back. This leads to a lower risk of injury and consequently to a higher safety for occupants of the crashed car.

Tested occupant safety

Tested occupant safety


Reliable breakthrough protection

Even in case of bad impacts the DELTA BLOC® system offers the highest possible protection against breakthrough of a vehicle.

turn around of a 38t – articulated lorry

Turn around of a 38t – articulated lorry


Small displacement of elements

The displacement of elements is clearly smaller than that of steel systems of the same containment level.

small displacement of the safety barrier even in case of extreme impacts

Small displacement of the safety barrier even in case of extreme impacts