Accident A3 25/04/2022
| Authority | Department of Infrastructure |
|---|---|
| Date received | 2024-08-07 |
| Outcome | Some information sent but not all held |
| Outcome date | 2024-08-28 |
| Case ID | 4043977 |
Summary
A request was made for detailed records regarding High Friction Surfacing works on the A3 at Sulby Bridge in early 2022 following an accident, to which the Department of Infrastructure responded with a purchase order and a code of practice document while stating not all information was held.
Key Facts
- The accident occurred on the A3 at Sulby Bridge on 25/04/2022.
- The contractor appointed for the road works was Colas (IOM) Ltd.
- The works involved the installation of two-pack epoxy tyre grip HFS Type 1.
- The purchase order for the works was dated 03/03/2022.
- The authority stated that some information was sent but not all was held.
Data Disclosed
- 25/04/2022
- 03/03/2022
- 1055 m²
- 2018872
- 2nd Edition April 2017
- November 2022
- early 2023
- BS 8870
- 30 DAYS
- 000 1153 67
- GB000115367000
Original Request
Information Required: Accident Location: A3 Sulby Bridge (what3words location - reported.coding.retailing) (1) Please provide details and documents from your records and those of the party to works were contracted to (Colas) of the road repairs, road surfacing works carried out in Sulby during March, April and May 2022 including High Friction Surfacing (HFS) installation works carried out, including for example: the location and extent of the site(s) included in the works; date of commencement of the works (and commencement of the works at the pertinent site, if different); date of completion of the works (and completion of the works at the pertinent site, if different) etc; (2) Details of the type of HFS system installed at the pertinent site including whether it was a 'hot applied' or 'cold applied' system etc; (3) Relevant contract details, including for example: details of the contractor appointed to carry out the works; the specification for the works and the quality standards that would have applied etc; (4) The contractor's method statement for the works; (5) Details of the specific items of work undertaken at the pertinent site, which should include reference to the dates when the various individual work activities were carried out. In addition to the installation of the HFS system itself, these activities would have included preparation works and post-installation activities, including sweeping operations, re-installing road markings and the installation and removal of temporary traffic management arrangements (including temporary warning signage for road users) etc; (6) Details of the temporary traffic management arrangements installed during each stage of the works at the pertinent site, including the dates and times when each arrangement was in place; (7) Details of the types and quantities of materials utilised by the contractor during the installation of the HFS system at the pertinent site; (8) Details of any and/or all sweeping operations carried out to remove loose material prior to the removal of the temporary traffic management arrangements and/or following the road being re-opened to uncontrolled traffic; (9) Details of any and all contractor and/or highway authority post-installation inspections and/or other checks to ensure that the works had been carried out satisfactorily in accordance with the contractual requirements, and/or to ensure that all loose material arising from the works had been removed from the highway; (10 Records of any and all third party reports and complaints received by the contractor and/or highway authority relating to the works; (11 Records of any and all reported accidents at the site(s) of the works that occurred during the course of the works and following completion of the works.
Data Tables (8)
| November 2022 - A review of this Code of Practice will take place, following the publication | |
|---|---|
| in early 2023 of BS 8870 - High friction surfacing – Specification. | |
| Revision | Page |
|---|---|
| Foreword updated | 2 |
| Introduction updated | 5 |
| Section 3 Types updated | 6 |
| New Section 4 on Asset Management | 7 |
| Section 5 Specification updated (editorial) | 7 |
| Section 6 Client information updated (editorial) | 8 |
| Section 9 Planning updated (editorial) | 9 |
| Section 11 Surface preparation updated and Table 1 removed. Advice on treating porous surfaces removed. | 11 |
| Section 12 Constituents updated (editorial) | 13 |
| Table 2 becomes Table 1: Chemical composition to be determined by XRF Spectrometry replacing EN 932-3 | 14 |
| Section 13 System requirements updated – cold lay machine applied section deleted as no machines operating in UK. Cold lay hand application section trimmed to avoid duplication with surface prep section. Durability section deleted as now covered by new Asset management section. Hot applied section updated. | 15 |
| Section 15 QA section updated (editorial). | 18 |
| Section 16 Training section updated (editorial) | 18 |
| Appendix A updated - Checklists | 20 |
| New Appendix B – 5 year guarantee criteria | 22 |
| Appendix C – Glossary updated | 23 |
| Appendix D added - references | 25 |
| Physical Property | Limits | Test Method |
|---|---|---|
| PSV 10/6 | 70+ | BS EN 1097-8:2009 |
| Abrasion Value 10/14 | ≤ 4 | BS EN 1097-8:2009 Annex A |
| Particle Density | ≥ 2.8 | BS EN 1097-6:2000 |
| Moisture Content | ≤ 0.5% | EN 1097-6:2000 |
| Particle Angularity | Blocked shape (not flakes) | Visual Assessment |
| Grading % passing | EN933-1:1997 | |
| 4.00 mm | 100% | |
| 3.35 mm | ≥ 95% | |
| 1.18 mm | ≤ 5.0% | |
| 0.60 mm | ≤ 0.5% | |
| Mineralogy | XRD | |
| Diasporic or Gibbsitic Corundum | 60-85% | |
| Chemical Composition | XRF Spectrometry | |
| Al O 2 3 | ≥ 82.0% | |
| Fe2O 3 | ≤ 4.5% | |
| SiO 2 | ≤ 12.5% | |
| K O+Na O 2 2 | ≤ 0.5% | |
| TiO 2 | ≤ 4.5% |
| Parameter | Type 1 | Type 2 | Type 3 |
|---|---|---|---|
| Skid resistance value (SRV) | ≥ 65 | ≥ 65 | ≥ 65 |
| Estimated overall system loss in the wheel tracks (%) | ≤ 25 | ≤ 25 | ≤ 25 |
| Texture Depth (mm) Mean Value | ≥ 1.0 | ≥ 1.0 | ≥ 1.0 |
| ADEPT | The Association of Directors of Environment, Economy, Planning and Transport previously known as the CSS (County Surveyors Society) |
|---|---|
| ADHESION | The property by which a binder sticks to the surface of a solid body e.g. the road or aggregate. |
| BBA | British Board of Agrement – a certification body which operates the HAPAS scheme for HFS. |
| BINDER | A liquid, comprised of resins mixed together |
| BOND | The adhesion between the binder and either the road surface or the applied Calcined Bauxite |
| CALCINED BAUXITE | A manufactured aggregate derived from calcining bauxite clay in a kiln at high temperatures to produce a very hard aggregate with exceptional skid resistance properties |
| CDM | Construction (Design and Management) Regulations providing legal advice on health and safety matters applying to construction sites |
| COSHH | Control of Substances Hazardous to Health |
| CURE | The chemical reaction between liquid constituents that results in a solid binder being formed |
| HAPAS | Highway Authorities Product Approval Scheme for certifying the performance in-situ of HFS systems |
| POLISHED STONE VALUE (PSV) | A measure of an aggregates resistance to polishing under traffic |
| QUALITY ASSURANCE (QA) | Systematic monitoring and evaluation of the various aspects of a High Friction Surfacing operation to ensure that minimum standards of quality are being attained by the production process. Registration to BSEN ISO 9001 issued to a contractor by a certification body indicates minimum standards are being attained. |
| RESIN | A solid or liquid synthetic organic polymer used as the basis of adhesives for bonding calcined bauxite to the road surface |
| SCRIM | A measure of the skid resistance of a road surfacing under wet conditions using a Sideways Force Coefficient Routine Investigation Machine |
| SCREEDED | A term used to describe the application or distribution of hot applied HFS onto a road surface in narrow strips transversely across the carriageway. |
|---|---|
| SECTOR SCHEME 12 | A national scheme endorsed by the major highway authorities to which contractors can become registered to demonstrate competency with regard to traffic management |
| SKIDDING RESISTANCE | The frictional forces between tyre and road which are available to oppose a vehicle skidding |
| TEXTURE DEPTH | A term used to denote the measure of projection of aggregates in a surface course |
| THERMOPLASTIC | The property of material by which their viscosity changes in relation to temperature change |
| THERMOSETTING | A material formed by an irreversible chemical reaction of two or more components which renders it resistant to temperature variations |
| TRAFFIC SIGNS MANUAL | Otherwise known as Chapter 8 published by the DfT providing advice on traffic management during road works, in particular how to set out signage on a site based on a risk assessment. |
| Redacted | |
|---|---|
| 25 April 2022 11:06 |
| Redacted | ||
|---|---|---|
| Redacted |
Full Response Text
Appendix 1 Department of Infrastructure Rheynn Bun-troggalys Currency Net amount Total discount VAT Purchase order totals GBP
Page 1 of 1 Invoice To Address Colas (IOM) Ltd Department of Infrastructure Support Services Ellerslie Depot Crosby Isle of Man IM4 2HA Broom House Foxdale Road Ballasalla Isle of Man IM9 3DW Purchase order Delivery Address Date 03/03/2022
Number
Requisition
Contact: Requisitioner
Telephone
Email Ellersliepurchasing.DOI@gov.im Line number Description
Quantity Unit Unit price Net VAT
10 Carry out High Friction Surfacing at Kerrowmoar as discussed on site & in accordance with Quote Ref :- 2018872 using two pack epoxy tyre grip HFS Type 1
1055 m²
WORK TO BE UNDERTAKEN OFF PEAK HOURS ONLY
Conditions of Order
Issued subject to the Department of Infrastructure Standard Conditions of Contract for Provision of Goods/Services and relevant
Agreements or Framework Agreements entered into between the supplier and the Department of Infrastructure which relate to
the Goods/Services set out in this order. The Standard Conditions can be viewed on our website at www.gov.im/about-the-
government/departments/infrastructure. The Isle of Man Government Procurement Policy and Financial Standing Instructions will
also apply which can be viewed or downloaded from: www.gov.im/about-the-government/offices/attorney-generals-
chambers/civil-division/procurement-division.
THE ORDER NUMBER ABOVE MUST BE QUOTED ON ALL DELIVERY NOTES AND INVOICES OR PAYMENT
MAY BE DELAYED. PLEASE DO NOT CHASE PAYMENT FOR INVOICES UNTIL A MINIMUM OF 30 DAYS
AFTER DATE OF INVOICE. VAT number: 000 1153 67 EORI Number is GB000115367000
Redacted
RedactedRedactedRedacted
RedactedRedacted
RedactedRedacted
RSTA ADEPT Code of Practice for High Friction Surfacing
2nd Edition April 2017
1
November 2022 - A review of this Code of Practice will take place, following the publication
in early 2023 of BS 8870 - High friction surfacing – Specification.
CODE OF PRACTICE FOR HIGH FRICTION SURFACING
RSTA ADEPT Code of Practice for High Friction Surfacing
2nd Edition April 2017
2
Foreword
This second edition of the Code of Practice has been produced by the Road Surface Treatments Association (RSTA) High Friction Surfacing Committee to embrace industry best practice and to reference current specification guidance contained within the HAPAS Product Certification Scheme.
This document has been peer reviewed by ADEPT Soils, Materials, Design and Specifications Committee.
The information contained herein is intended to represent industry best practice. No liability is accepted by RSTA or ADEPT for any damages caused to property or personal injury resulting from using the guidance contained within this document.
RSTA is the Road Surface Treatments Association www.rsta-uk.org
ADEPT is the Association of Directors of Environment, Economy, Planning and Transport www.adeptnet.org.UK RSTA ADEPT Code of Practice for High Friction Surfacing 2nd Edition April 2017 3
Contents Page
- Introduction 5
- Suitable sites for HFS 6
- Types of High Friction Surfacing 6
- Asset management 7
- Specification for High Friction Surfacing 7
- Information to be provided by the client 8
- Planning and coordination 9
- Safety, Health and Environment (SHE) 9
- Planning the execution of the work 10
- Traffic management 11
- Surface preparation 11
- Constituents 13
- Detailed requirements For each system 15
- Performance Criteria 17
- Quality Assurance 18
- Training 18
- Road Surface Treatments Association 19 Appendix A - Checklists 20 Appendix B - Key points for offering a 5 year guarantee 22 Appendix C - Glossary of terms 23 Appendix D - References 25 RSTA ADEPT Code of Practice for High Friction Surfacing 2nd Edition April 2017 4
DOCUMENT CONTROL
Issue Statement
Issue 2 April 2017
REVISION LIST – AMENDMENTS MADE IN THIS ISSUE
Revision Page Foreword updated 2 Introduction updated 5 Section 3 Types updated 6 New Section 4 on Asset Management 7 Section 5 Specification updated (editorial) 7 Section 6 Client information updated (editorial) 8 Section 9 Planning updated (editorial) 9 Section 11 Surface preparation updated and Table 1 removed. Advice on treating porous surfaces removed. 11 Section 12 Constituents updated (editorial) 13 Table 2 becomes Table 1: Chemical composition to be determined by XRF Spectrometry replacing EN 932-3 14 Section 13 System requirements updated – cold lay machine applied section deleted as no machines operating in UK. Cold lay hand application section trimmed to avoid duplication with surface prep section. Durability section deleted as now covered by new Asset management section. Hot applied section updated. 15 Section 15 QA section updated (editorial). 18 Section 16 Training section updated (editorial) 18 Appendix A updated - Checklists 20 New Appendix B – 5 year guarantee criteria 22 Appendix C – Glossary updated 23 Appendix D added - references 25 RSTA ADEPT Code of Practice for High Friction Surfacing 2nd Edition April 2017 5
-
Introduction This Code of Practice has been written by the Road Surface Treatments Association High Friction Surfacing (HFS) Sector and ADEPT to assist procurers and installers to obtain a high quality durable surface treatment. HD36, Table 3.1 in the Design Manual for Roads and Bridges recommends the use of HFS on road sites which have been identified as being in the highest risk category requiring the highest level of surface friction. It represents best practice for the selection and application of High Friction Surfacing Systems to maximise their performance and durability. High Friction Surfacing is essential in many locations on the network to keep the road surface adequately safe for road users. To obtain the best results it is necessary to give careful consideration to a wide range of details and to plan and design the work carefully and to use only HAPAS Approved installers. HAPAS categorises systems as Type-1, 2 and 3 systems, where Type-1 has attained the highest performance level. All comply with Clause 924 of the Specification for Highways Works, part of the Manual of Contract Documents for Highway Works. The type of application in which these products are used and the prevailing ambient conditions at the time of installation are also important to ensure long term durability of the product. The purpose of this Code is to identify the important aspects of the process, and to refer to other documents relating to good applications of high friction surfacing and so give practical guidance on achieving high quality. This document is to be reviewed annually jointly by RSTA and ADEPT. The Road Safety Marking Association (RSMA) and the Road Safety Surfacing Association (RSSA) endorse this document and encourage their members to support the use of the guidance contained herein. RSTA ADEPT Code of Practice for High Friction Surfacing 2nd Edition April 2017 6
-
Suitable sites for HFS Each Local Authority should have a Skid Resistance Policy that defines the way that the Investigatory Level is determined for a site using the guidance contained within HD28. To the highway engineer, high friction surfacing offers a surface application that provides a high level of skid resistance and so enhances safety and reduces accidents for high risk sites. High risk sites are generally defined as those requiring an Investigatory Level (IL) of 0.50 and above for friction as defined in the Design Manual for Roads and Bridges (DMRB) Volume 7 HD36 Table 3.1 (measured by SCRIM). These include: • approaches to major junctions • approaches to pedestrian crossings when pedestrians or other vulnerable road users may misjudge the speed of the traffic, for example near schools or where children cross, near public houses or where the approach speed is high • sites with gradients steeper than 10% if other hazards are present • bends with a radius of tighter than 500m on single carriageways, if there are risk factors present or a particular potential for loss of control such as an adverse camber or the geometry of the band is potentially hazardous for the traffic speed Guidance on the selection of sites requiring HFS is also provided in ADEPT (CSS) Guidance - Use of High Friction Surfacings available from http://www.adeptnet.org.uk. The site categories described in general above, together with the traffic levels at which HFS becomes necessary are detailed in the DMRB Volume 7 HD 36 available from www.dft.gov.uk/ha/standards/dmrb/. A useful way of comparing the effectiveness of a High Friction Surfacing is through correlation between accident black spots prior to high friction surfacing systems being applied and the results after the application of the systems. Between 1991 and 2001 MOLASSES (MOnitoring Local Authority Safety SchemES) monitored a total of 2,309 Road Safety Schemes in the UK and calculated the Average Annual Accident Saved per year, by deducting the average number of accidents per year, after implementing each scheme from the average number of accidents prior to implementation. High Friction Surfacing achieved an accident reduction rate of 35.1% based on a site balance of 10% rural and 90% urban roads.
-
Types of High Friction Surfacing There are two main categories of HFS – Cold Applied and Hot Applied.
Cold Applied These systems comprise a resin adhesive that bonds the prescribed aggregate typically graded 1-3mm to the prepared substrate. The aggregate is very hard with a low Aggregate Abrasion Value (AAV) and with a high Polished Stone Value (PSV) that provides the necessary friction with the tyre. Cold applied resins include epoxy, polyurethane [PU], polyurea, methyl methacrylate [MMA] and polyurethane modified MMA. RSTA ADEPT Code of Practice for High Friction Surfacing 2nd Edition April 2017 7
Cold applied resins are installed as a continuous film of adhesive. These are blended mechanically and then manually applied by squeegee onto which the aggregate is broadcast. Once the resin has cured, excess aggregate is removed by sweeping. Further details are provided in Section 12 below.
Hot Applied
For hot applied materials, the pre-mixed resin and aggregate is heated in a boiler at high
temperature ensuring the material is mixed and workable. The hot thermoplastic material
is screeded out in adjoining strips to cover the whole surface.
Further details are provided in Section 12 below.
-
Asset Management Local authorities will have a skid policy which will determine where and when HFS is used. These products are normally used on road sections on approaches to junctions, roundabouts and pelican crossings where a reduced braking distance is deemed essential for road safety and the Investigatory Level (IL) for SCRIM is 0.5 or above. In terms of service life a two year study conducted by the BBA in 2013-14 concluded that the vast majority of HFS sites investigated gave a minimum service life of 5 years and on average hot applied systems demonstrated 8 years life and cold applied systems 12 years life. A SCRIM survey conducted on London roads in 2015 concluded that on sites requiring an IL of 0.55 or above calcined bauxite out performed other aggregate types over time.
-
Specification for High Friction Surfacing High Friction Surfacing must comply with Specification for Highway Works (SHW) Clause 924 which requires such systems to be HAPAS certificated. Successful certification under the HAPAS scheme involves meeting demanding performance criteria which are given in each system’s certificate and meeting stringent Quality Assurance and Quality Control requirements on an ongoing basis. The three key paragraphs are repeated as follows: 1 High friction surfacing systems shall have current HAPAS Roads and Bridges Certificates. 2 A high friction surfacing system with a current HAPAS certificate shall only be installed by a contractor approved by the HAPAS scheme provider and the certificate holder as an approved installer for that system. 3 The installation and quality control procedures shall be in accordance with the HAPAS certificate for each system and the current method statement agreed by the scheme provider. The results of all quality control checks carried out on site by the contractor and quality assurance information compiled in accordance with the requirements of the certificate, including results from surveillance visits, shall be made available to the overseeing organisation on request.
Clause 924 is an end performance specification. This transfers the responsibility for the design of the high friction system to the selected installer who is responsible for the RSTA ADEPT Code of Practice for High Friction Surfacing 2nd Edition April 2017 8
execution of the surface treatment and generally guarantees the treatment for a specified period of time. Clause 924 provides a limited guarantee of a minimum of 2 years, subject to the following rider: This guarantee shall exclude defects arising from damage caused by settlement, subsidence or failure of the carriageway on which the surfacing has been applied, but shall cover failure to meet the minimum requirements set out in Table 4 of the HAPAS ‘Guidelines Document for the Assessment and Certification of High Friction Surfaces for Highways’. If the client specifies that high friction surfacing is installed in full compliance with this Code of Practice then the installer should be able to provide a 5 year guarantee for the appropriate class of system (refer to Appendix B). There are three classes of HFS; Type 1, Type 2 and Type 3 depending upon the volume of commercial vehicles using the lane. Details are contained in the Guidelines Document for the Assessment and Certification of High Friction Surfacing obtainable from www.bbacerts.co.uk . For each site category designers have discretion in how to use the guidance given in the local authority skid policy document and for Highways England HD28/15. Refer to the HAPAS Guidelines Document for the Assessment and Certification of High Friction Surfacing for Highways – Table 2 Area of Application by Type Classification. This guidance and the guarantee of durability that it provides, only applies to systems manufactured and installed in accordance with Clause 924. The www.bbacerts.co.uk website provides a full list of approved systems and installers for each product should the client wish to verify any information. Further information on the requirement of the HAPAS Scheme is given in Section 14 Performance Criteria.
- Information to b
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