7 Revision 33 October 2022
2.4 Vehicle intrusion
Consideration must be given to the available space behind the VRS
system to ensure that the errant vehicle does not strike the obstruction
when the system is impacted. Although a system may have a working
width of W2 ≥ 800mm its class of normalised vehicle intrusion (VI)
rating may be VI4 ≥1300mm.
See sketch below.
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