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EN 12767 European Standard

The LIER offers a wide range of services, among which crash-testing according to the requirements of EN 12767 standard, which corresponds to the Passive safety ofsupport structuresforroad equipment.

This standard was developed by the CEN/TC226/WG10 Working Group (of which LIER is a member). The French version of the standard, published in October 2011, is available on the website of the French standardization association, AFNOR.

More information on: AFNOR

EN 12767 specifies performance requirements and defines levels in passive safety to reduce the severity of injury to the occupants of vehicles impacting head-on with the permanent road equipment support structures.

The method is applicable to all types of support structure. In practice, the light poles and masts supporting signs are the most common applications.

Collisions with fixed objects at a driving speed of 50 km/h or more entail a real risk of fatal injury or permanent disability to car occupants. Two solutions exist to counteract this effect: avoiding any risk of impact, a stationary object can be protected with a road restraint system (which induces itself a risk) or second solution, the magnitude of the consequences in case of impact can be voluntarily reduced by weakening the structure.

EN 12767 describes a method, based on a real impact test, which evaluates and classifies the effect of this weakening.

The method

The crash-test is performed with a standard personal vehicle (w = 900 ± 40 kg) at an angle of 20 °. The deformation and deceleration of the vehicle due to the impact should be limited. If parts of the structure tested come out of the system under impact, they must not enter the passenger compartment.

Approach path

A- Categories

  1. HE: High energy absorption
  2. LE: low energy absorption
  3. NE: no energy absoprtion

The energy absorption is determined by the difference between the impact speed and the post-impact speed (measured 12m after the impact point with a test-object)

Impact Speed

(km/h)

50

70

100

Energy Absorption Category

Exit Speed – ve(km/h)

HE

ve = 0

0 ≤ ve ≤ 5

0 ≤ ve ≤ 50

LE

0 < ve ≤ 5

5 < ve ≤ 30

50 < ve ≤ 70

NE

5 < ve ≤ 50

30 < ve ≤ 70

70 < ve ≤ 100


B- Levels of performance

The consequences if impact are determined by ASI and THIV values.

The standard provides four levels to express the safety of the occupant. Levels 1, 2 and 3 require:

  • A test at low speed (35 km / h)
  • A test at a velocity chosen to be the target level (50, 70 or 100 km / h).

Level 4 is for support structures with high level of security, whose behavior can be determined by a simplified test conducted at the impact speed of the class concerned.

   

Mandatory Impact Test at 35km/h

Mandatory Impact Test at 35 km/h

Impact Test 50, 70 and 100 km/h

Impact Test 50, 70 and 100 km/h

Energy Absorption Category

Level of safety of the inoccupants

Maximum Values ASI

Maximum Values THIV (km/h)

Maximum Values ASI

Maximum Values THIV (km/h)

HE

1

1,0

27

1,4

44

HE

2

1,0

27

1,2

33

HE

3

1,0

27

1,0

27

LE

1

1,0

27

1,4

44

LE

2

1,0

27

1,2

33

LE

3

1,0

27

1,0

27

NE

1

1,0

27

1,2

33

NE

2

1,0

27

1,0

27

NE

3

0,6

11

0,6

11

NE

4

No requirement

No requirement

Difference vehicle speed impact / exit speed ≤ 3km/h

Difference vehicle speed impact / exit speed ≤ 3km/h