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02/08/2010

Self Righting Bollards - BS 8442 explained

With Keep Left Bollards, Passive Safety is certainly an important requirement. However did you know that BS 8442:2006 also requires Retro Reflective Bollards to stay intact and importantly ‘self right’ after an impact?

Here we explain why highway professionals need to be using BS 8442:2006 to specify Retroreflective Self Righting Bollards (RSRBs).

BS 8442:2006 is titled ‘Miscellaneous road traffic signs and devices - Requirements and test methods’. Within its scope is a range of highway features and it specifically includes in section 14 ‘requirements and tests for self righting bollards’. It defines Retroreflective Self Righting Bollards (RSRB) as a ‘retroreflective self righting device normally mounted on a refuge or traffic island’.

Importantly within the References it makes it clear that BS 8442:2006 is to be used in conjunction with other standards including BS 12767 ‘Passive safety of support structures for road equipment’. BS 8442 therefore does not replace other standards but encompasses them and brings in other facets and requirements at the same time to produce a higher standard.

The extra requirement within BS 8442 for RSRBs and the difficult part to achieve over and above BS 12767 is the Physical Performance standard. BS 8442:2006 Section 14 sets out the specific requirements for RSRBs and within the Physical Performance there is the High Impact Test. The standard clearly states the performance criteria;

“When tested in accordance with BS EN 12767 the RSRB shall remain in position and no portion of the RSRB exceeding 25g shall become detached. The RSRB shall return to its original position or have a residual deflection of no more than 10% of its height measured at the upper extremity no more than 15 minutes after the time of impact. When tested in accordance BS EN 12767 the RSRB shall meet one of the following standards 100,NE,4; 70,NE,4; or 50,NE,4”.

BS 8442 is therefore looking for the product (at speeds of 100kph, 70kph or 50kph) to remain intact and return to an almost upright position after the impact. At the same time it is also asking for the product to meet passive safety criteria but it is clear that this High Impact Test is more comprehensive than the passive safety test BS12767.

Finally, there is now also a ‘Torsion Test’ with the performance criteria clearly defined as;
“When Tested in accordance with prEN 12899-2:2006, 5.6.4 the RSRB and its mounting shall remain in place and the permanent (residual) angular deflection shall not exceed 5 degrees. The signs, plain surfaces or components of the external surface shall not be damaged or dislodged from their mountings”

In conclusion; whenever specifying RSRBs, BS 8442:2006 should always be quoted in the knowledge that this standard will also cover the familiar BS12767 Passive Safety requirements and Highway Engineers will receive products that conform to current standards, and will also be more robust and require less frequent replacement.

The Night Owl Keep Left Bollard from  LEAFIELD Environmental (Formally known as Linpac Environmental) has passed BS 8442:2006 achieving 70, NE, 4.

Night Owl:

  • Passes the High Impact Resistance test at 70 km/h. Returns to 98% of its original height in 1.8 seconds.
  • Vehicle speed reduced by 2.6km/h (standard is less than 3km/h) giving the highest passive rating for vehicle occupants (NE,4).
  • No material lost on impact, standard allows 25gms.

  • Grit/Salt Bins
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