ABBREVIATIONS
WORKING WIDTH AND DEFLECTION
WORKING WIDTH
IMPACT TEST CRITERIA
COMPARISON OF IMPACT ENERGY LEVELS - EN1317-2
TESTS
BS British Standard written to approve VRS by means of testing
BSI British Standards Institution
EN European Norm
IRRRS Interim Requirements for Road Restraint Systems
VRS Vehicle Restraint Systems
UKAS United Kingdom Accreditation Service
BS EN 1317 A specification for the testing of vehicle restraint systems. The requirements for each test eg. angle, speed, weight is stated within BS EN 1317
TVCB Concrete barriers
LANTRA Training school
The effective Working Width of ASSET VARIOGUARD®, anchored at each end only, is W5.
The Working Width of ASSET VARIOGUARD® anchored at 20m is W4.
TRL note on tests completed for ASSET - “Since the flanged base of the ASSET VARIOGUARD® extends 150mm in from the traffic face the set back distance of the barrier can be reduced by 150mm without adversely affecting the performance of the barrier. As a concequence the Working Width can be reduced by a corresponding distance.”
WORKING WIDTH AND DEFLECTION
The width of the barrier and the deflection upon collision.
| Classes of working width | Levels of working width (m) |
| W1 | < 0.6 |
| W2 | < 0.8 |
| W3 | < 1.0 |
| W4 | < 1.3 |
| W5 | < 1.7 |
| W6 | < 2.1 |
| W7 | < 2.5 |
| W8 | < 3.5 |
| Class | Test | Impact Speed (km/h) | Impact Angle (degrees) | Total Vehicle mass (kg) | Vehicle |
| TB11 | 100 | 20 | 900 | Car | |
| T1 | TB21 | 80 | 8 | 1,300 | Car |
| T2 | TB22 | 80 | 15 | 1,300 | Car |
| N1 | TB31 | 80 | 20 | 1,500 | Car |
| N2 | TB32 | 110 | 20 | 1,500 | Car |
| T3 | TB41 | 70 | 8 | 10,000 | Rigid HGV |
| H1 | TB42 | 70 | 15 | 10,000 | Rigid HGV |
| H2 | TB51 | 70 | 20 | 13,000 | Bus |
| H3 | TB61 | 80 | 20 | 16,000 | Rigid HGV |
| H4a | TB71 | 65 | 20 | 30,000 | Rigid HGV |
| H4b | TB81 | 65 | 20 | 38,000 | Articulated HGV |
COMPARISON OF IMPACT ENERGY LEVELS - EN 1317-2
| Test | Vehicle centre of gravity (m) | Containment class | Vehicle mass (kg) | Impact angle (degrees) | Speed (km/h) | Energy (kJ) |
| EN 1317-2 | ||||||
| TB11 | 0.53 | N2,H2 | 900 | 20 | 100 | 41 |
| TB32 | 0.53 | N2 | 1,500 | 20 | 110 | 82 |
| TB51 | 1.4 | H2 | 13,000 | 20 | 70 | 287 |
| NCHRP350 | ||||||
| NCHRP 350 3-10, 4-10, 5-10, 6-10 | 0.53 | TL3 | 820 | 20 | 100 | 37 |
| NCHRP 350 3-11, 4-11, 5-11, 6-11 | 0.65 | TL3 | 2,000 | 25 | 100 | 138 |
TESTS:
TB11 European small car test
TB32 UK Normal Containment
TB51 UK High Containment
NCHRP 350 3-10, 4-10, 5-10, 6-10 USA small car test
NCHRP 350 3-11, 4-11, 5-11, 6-11 USA pickup test (US Norm)