6 Revision 33 October 2022
In central reserves where there are two single sided safety barriers it must
be ensured that the working width is maintained between the two.
Note: For either of the above situations, a departure from standard must be
obtained from the overseeing authority.
2.2 C
ontainment level
This is the type of vehicle the system is designed to retain at a given speed
and angle of impact, see table below for the test criteria.
The system identification is made up of the containment level and the
working width for example N2 W2 for details of the available systems and
the post centres please see the table on page 8 and the working width table
below.
2.3 Working Width
The working width is the distance between the traffic face of the VRS and
the furthest point of deflection and therefore a safety barrier should be
selected to suit the location, see table below for working width classes
KPH MPH
N2 1500kg Car 110 68 20 degrees
900kg Car 100 62 20 degrees
H1 10000kg Rigid HGV 70 44 15 degrees
900kg Car 100 62 20 degrees
H2 13000kg Bus 70 44 20 degrees
900kg Car 100 62 20 degrees
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