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State of progress

High friction surfacing

Approval is being carried out to working draft guidelines and certificates have been issued for six proprietary high friction surfacing materials. SG1 is reforming this year to extend the guidelines to cover approval of colour retention of pigmented high friction surfacings.

Overbanding and crack sealing

Working draft of approval guidelines are in place and the BBA is talking to potential clients. Suppliers of the few proprietary products available are developing them to iron out recognised deficiencies, such as skid resistance, and to meet HAPAS requirements, which SG2 deliberately set relatively high to encourage product improvements.

Thin surfacing

Working draft of guidelines has been in place since April 1999 and more than 20 applications are being considered. The BBA expects to award the first certificates early this year. Products already holding Highways Agency approval, or which have already been monitored under traffic for two years, have a head start on the rest.

Modified binders

Three guideline documents are in working draft form: modified binders for asphalt; modified binders for micro surfacing, surface dressing and bond coats; and modifiers for asphalt mixtures. Very few applications in this category have been received, partly due to modified binders being HAPAS approved as part of requirements for accreditation of thin surfacings. The Highways Agency has set a deadline of March 2001 for HAPAS accreditation of all modified binders and modifying additives used on its network.

Cementitious repair systems

BBA is inviting applications for accreditation following HiTAC approval of the guidelines submitted by SG5 in 1999. According to the BBA, uptake has been very disappointing, partly due to the small size of the market. All cementitious repair products must be HAPAS accredited for use on the Highways Agency's network by January 2001.

Parapet anchorages

HAPAS took over the Highways Agency's approval system for parapet anchorages in 1998. Certificates have been awarded to 27 products in this category so far.

Bridge deck waterproofing

The Highways Agency's system for approving waterproofing membranes is being transferred to HAPAS. Development of the guidelines is continuing as SG7's work to produce additional tests to prove the suitability of products for local authority road bridges has taken longer than expected, according to the BBA.

Permanent coldlay surfacing materials

The Highways Authorities & Utilities Committee's (HAUC) approval system for PCSMs, which has suffered from

over-complexity, is being taken over by HAPAS from

the National Joint Utility

Group. Guidelines have been approved by HiTAC but are under review by the DETR and its lawyers as PCSM approval is linked to statutory requirements laid out by the 1991 Streetworks Act. Current HAUC certificates will remain valid for two years from September 1999.

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