TD 19/06
REQUIREMENT FOR ROAD RESTRAINT SYSTEMS
BD 52/93 and IRRRS (Interim Requirements for Road Restraint Systems) have now been superseded by TD 19/06.
The design process includes carrying out a risk assessment to identify the hazards and minimise the risks to the road users.
The risk assessment is documented by using an Excel spreadsheet, a copy of which can be obtained from the Highways Agency's website
http://www.highways.gov.uk/business/12081.aspx
A user-guide is also available on the same web-page.
TD 19/06 also directs the designer to use BS 6779 and BS 7818 for the design of specific elements of parapets.
BS 6779: 1998 - Highway Parapets for Bridges and Other Structures.
Part 1: Metal Parapets for the provision of infill to parapets (see TD 19/06 clause 4.29, 4.39, 4.40)
Part 2: Concrete Parapets for the design of reinforced concrete parapets with some amendments (see TD 19/06 clauses 4.56 to 4.60)
Part 4: Reinforced and Unreinforced Masonry Parapets to assess the containment capacity of existing masonry parapets (see TD 19/06 clause 4.62)
BS 7818: 1995: Pedestrian Metal Parapets
This Standard is required for the manufacture and installation of pedestrian restraint systems until such times as the drafting of prEN 1317-6 is completed (see TD 19/06 clause 9.3).
Metal Parapets are designed and tested by manufactures who
apply to the Highways Agency to be included on an Approved List. A copy of
the "Highways Agency's Approved Road Restraint System List" can
be obtained from their website http://www.highways.gov.uk/business/8720.aspx
