Road Restraint Systems

Technical specifications


PASS+CO guardrails are designed and built in total compliance with the relevant safety standards.

The relevant European standard EN 1317 (Road restraint systems) specifies the performance requirements for restraint systems and defines performance classes and crash test acceptance criteria, for EC performance certification.

European Norm EN1317

Performance classes, crash test acceptance criteria test methods in accordance with EN 1317-1 and -2

All guardrails for installation in ground, asphalt or concrete structures undergo crash tests to certify their compliance with EN1317.

EN1317 defines levels of performance: 


  • The performance class of the product (for which vehicles it is tested and under which conditions)

  • The “safety level” of the product under impact (through bio-mechanical indexes it is possible to rate the probability of injuries resulting from an impact with the product)

  • The space needed for its smooth operation (how much space it ‘takes’ during the impact, the amount of deformation after the impact...)

The standard establishes the following criteria for the control of test results, in order to guarantee the product’s safety.



Severity indices must be reported for all tests with light vehicles.

All PASS+CO guardrails have a  performance index (ASI and THIV) that guarantees the highest safety level  for the vehicle occupants.

Impact severity levels


The parameters which define a guardrail’s deformation are its working width (W), its dynamic deflection (D) and the vehicle intrusion (VI).


The working width is the distance between the side facing the traffic before the crash and the maximum dynamic lateral position of the guardrail itself.

The dynamic deflection is the maximum lateral displacement of the guardrail facing the traffic.

The vehicle intrusion parameter measures the maximum lateral dynamic position of the vehicle.

Classes of normalised working width levels

The vehicle intrusion parameter measures the maximum lateral dynamic position of the vehicle.

Levels of normalised vehicle intrusion

The conformity of road restraint systems is obtained by CE marking which can be achieved with fulfilling and control of notified body of:

  1. Initial Type Testing (ITT)

  2. Factory Production Control (FPC)

  3. Declaration of Performance (DOP)

Technical specifications

One of the ways to improve road safety is by using road restraint systems. Road restraint systems keep vehicles in their roadway. In Europe, they are categorised as construction products and are therefore subject to Construction Product Regulation. To be used within the European Union road restraint system may only be offered or traded once their usability has been proven.