What is Vehicle Intrusion?

 

The vehicle intrusion (VI) is the maximum vehicle deviation dimension of the impacting vehicle from the traffic face of the VRS. The actual VI is an issue which is potentially causing confusion with layout designers.

 

Testing carried out in compliance with EN1317-2: 1998  measured the VI to the maximum dynamic lateral position of the HGV (i.e. H1, H3, H4a and H4b vehicles), which may have had a flat bed, a curtain sided or a box sided construction, e.g. if a flat-bed vehicle was used then the VI would have likely been the same or slightly greater than the WW of the VRS. If the VI was recorded as a higher class than the WW, then the reported WW of the system would be based on this VI value.

 

Testing carried out in compliance with the updated EN1317:2: 2010  measures the VI to the furthermost part of the HGV which includes a notional load having the width and length of the vehicle platform and a total height of 4m from the ground. This addresses the ‘worst-case’ lean scenario for H1, H3, H4a and H4b HGV’s with different platform constructions.

 

The VI measurement for the H2 under EN1317-2:2010 remains unchanged from that in EN1317-2:1998, i.e. its maximum dynamic lateral position.

 

Hence in the testing of higher containment VRS’s (excepting H2) there could be an increase in the VI for H1, H3, H4a or H4b that has been reported to EN1317-2: 2010  when compared to the reported VI for an EN1317-2:1998 test. 

 

In conclusion, it is suggested that all H1, H3, H4a and H4b VRS’s should have ALL the VI and WW variances stated on the CE mark to allow designers to produce effective and safe VRS layouts.

 
 
 
 
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VIm= Vehicle intrusion