Varioguard is claimed to be the first steel temporary barrier to be accepted for use on the UK road network. It comprises 12m lengths of standard steel section which are bolted together, the complete run standing unfixed on the road.
Anchorage is only necessary at the end terminals and is achieved by inserting a tube into a core drilled hole and fixing the terminal with an anchor post.
Varioguard is thought to be the only mobile road safety barrier available in the UK which has been tested to the H2 containment level of the current Euronorm. This covers vehicles up to and including a 13t bus.
New requirements due to come into force soon will affect how the safety barrier is specified. Already the BSEN1317 Euronorm adopted in 1998 incorporates high containment work zone protection requirements relating to barriers. A performance class and maximum deflection will be specified in the new TD 19/85 document due to be issued this year. This will be a legally binding document with a time limit for compliance. It will be accompanied by a guidance document for barrier types.