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Interim Advice Notes

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Interim Advice Notes (IANs) provide supplementary guidance not contained within current standards.

IANs are first issued by Highways England and are listed on the Highways England website (external site). These are only used in connection with works on motorways and trunk roads in England.

Interim Advice Notes Wales –IAN (W)

Once IANs have been issued by Highways England they are then considered for adoption on the Welsh motorway and trunk road network by us. Then the IANs which are considered appropriate for adoption on the Welsh trunk road network are issued by us as an IAN (W). They follow the Highways England numbering system with the year of issue in Wales and the suffix (W), e.g. IAN 154/14(W)

Any IAN issued by the Highways England, but not issued as an IAN (W) is not for use on the Welsh motorway and trunk road network.  This may be because the IAN is not considered suitable for the Welsh network, or that the merits of the IAN are still being considered by us. For clarification on the status of any IAN in Wales please email us at; Standards_Feedback_and_Enquiries@wales.gsi.gov.uk

Sometimes we develop our own IANs and these have a unique number system following a 1000 series and include the year of issue in Wales along with the suffix (W), e.g. IAN 1001/15(W).

You can find all the published IAN (W) s below.

Reading IANs

Some IANs must be read in conjunction with the Design Manual for Roads and Bridges (DMRB) and the Manual of Contract Documents for Highway Works (MCHW), whilst other IANs provide stand alone guidance and may be related to other documents, such as Chapter 8 of the Traffic Signs Manual, or relate to specific situations such as environmental cases (e.g. Ash dieback disease).

Interim Advice Note 181/15(W) Guidance on the use of Impact Protection Vehicles for Temporary Traffic Management

Interim Advice Note 181/15(W) Guidance on the use of Impact Protection Vehicles for Temporary Traffic Management

30/11/15
Guidance on the use of Impact Protection Vehicles (IPVs) for temporary traffic management (TTM), in order to reduce risks to road workers. This IAN provides guidance to service providers on the purpose of IPVs and on the management of risk associated with their use.
 
Interim Advice Note 180/15(W) Guidance for the selection of remote controlled temporary traffic management signs

Interim Advice Note 180/15(W) Guidance for the selection of remote controlled temporary traffic management signs for use on the Welsh Government’s trunk road and motorway network

30/11/15
This document gives guidance to purchasers and users on the selection of remote controlled temporary traffic management signs for use during road works.
 
Interim Advice Note 49/14(W) Use of Warning Signs for new Asphalt Road Surfaces

Interim Advice Note 49/14(W) Use of Warning Signs for new Asphalt Road Surfaces

22/03/15
This Interim Advice Note supersedes the guidance provided previously (IAN 49/03) regarding the use of warning signs in connection with the skid resistance of new asphalt surfaces.
 
Interim Advice Note 177/14(W) Introduction of the Construction Products Regulation (EU) 305/2011

Interim Advice Note 177/14(W) Introduction of the Construction Products Regulation (EU) 305/2011

27/01/15
This Interim Advice Note provides guidance relating to the introduction of the Construction Products Regulations. It should be used by all those involved in the specification or supervision of highway works.
 
Interim Advice Note 157/14(W) Thin Surface Course Systems - Installation and Maintenance

Interim Advice Note 157/14(W) Thin Surface Course Systems - Installation and Maintenance

27/01/15
This interim advice note revises HD37/99 Chapter 6. It provides revised requirements and guidance on the project specific specification, installation and maintenance of thin surface course systems on the strategic road network.
 
Interim Advice Note 156/14(W) Revision of Aggregate Specification for Pavement Surfacing

Interim Advice Note 156/14(W) Revision of Aggregate Specification for Pavement Surfacing

27/01/15
This Interim Advice Note provides updated advice on the selection of polished stone value (PSV) of aggregates used in pavement surfacing.
 
Interim Advice Note 154 /14(W) Revision of SHW Clause 903, Clause 921 and Clause 942

Interim Advice Note 154 /14(W) Revision of SHW Clause 903, Clause 921 and Clause 942

27/01/15
This Interim Advice Note revises the specification for location of longitudinal surface joints and the initial texture depth for thin surface course systems.
 
Interim Advice Note 124/14(W) Use of Eurocodes for the design of highway structures

Interim Advice Note 124/14(W) Use of Eurocodes for the design of highway structures

04/11/14
This Interim Advice Note supersedes IAN123/10(W) and takes immediate effect.
 
Interim Advice Note 135/10 (W) Landscape and Visual Effects Assessment

Interim Advice Note 135/10 (W) Landscape and Visual Effects Assessment

11/04/14
This Interim Advice Note provides instructions for assessing the visual impact of highway projects.
 
INTERIM ADVICE NOTE 172/13 (W) Ash dieback – Chalara fraxinea

INTERIM ADVICE NOTE 172/13 (W) Ash dieback – Chalara fraxinea

30/09/13
The purpose of this Interim Advice Note is to guide the Welsh Government Transport’s operations and suppliers in the appropriate response to Ash dieback disease, Chalara fraxinea.
 
Interim Advice Note 152/11 (W) - Road Safety Audit – Compliance with EC Directive 2008/96/EC

Interim Advice Note 152/11 (W) - Road Safety Audit – Compliance with EC Directive 2008/96/EC

01/12/11
This Interim Advice Note (IAN) provides supplementary guidance to the requirements contained within the Road Safety Audit Standard HD19/03.
 
Interim Advice Note 126/09 (W) - Environmental Impact Assessment: Reporting of the Determination and Publication of Notices

Interim Advice Note 126/09 (W) - Environmental Impact Assessment: Reporting of the Determination and Publication of Notices

30/07/11
This Interim Advice Note (IAN) provides supplementary guidance for the determination process.
 
Interim Advice Note 125/09 (W) - Supplementary guidance for users of design manual for roads and bridges (DMRB) Volume 11 'Environmental Assessment'

Interim Advice Note 125/09 (W) - Supplementary guidance for users of design manual for roads and bridges (DMRB) Volume 11 'Environmental Assessment'

29/07/11
This Interim Advice Note provides guidance for users when carrying out environmental impact assessment for projects.
 
Interim Advice Note 116/08 (W) - Nature Conservation Advice In Relation To Bats

Interim Advice Note 116/08 (W) - Nature conservation advice in relation to bats

27/07/11
This Interim Advice Note (IAN) provides guidance on the effects of roads on bats and the methods available to mitigate these effects.
 
nterim Advice Note 105/08 (W) – Implementation of Construction (Design and Management) Regulations 2007 and the withdrawal of SD 10/05 and SD 11/05

Interim Advice Note 105/08 (W) – Implementation of Construction (Design and Management) Regulations 2007 and the withdrawal of SD 10/05 and SD 11/05

26/07/11
This Interim Advice Note (IAN) provides guidance on some Health and Safety information not covered in Health and Safety Exectives (HSE) Approved code of Practice “Managing Health and Safety in Construction”.
 
Interim Advice Note 97/07 (W) – Assessment and Upgrading of Existing Vehicle Parapets

Interim Advice Note 97/07 (W) – Assessment and Upgrading of Existing Vehicle Parapets

25/07/11
This Interim Advice Note provides advice on the assessment of parapet and safety barrier supporting members on bridges and retaining walls.
 
Interim Advice Note 96/07 (W) – Guidance on Implementing Results of Research on Bridge Deck Waterproofing

Interim Advice Note 96/07 (W) – Guidance on Implementing Results of Research on Bridge Deck Waterproofing

24/07/11
This Interim Advice Note (IAN) provides guidance on improving the performance of surfacing to bridge decks.
 
Interim Advice Note 95/07 (W) – Revised guidance regarding the use of BS8500 (2006) for the design and construction of structures using concrete

Interim Advice Note 95/07 (W) – Revised guidance regarding the use of BS8500 (2006) for the design and construction of structures using concrete

23/07/11
This Interim Advice Note (IAN) provides guidance regarding the design and construction of structures using concrete.
 
Interim Advice Note 91/07 (W) – Interim Advice on the Identification of ‘Particularly at Risk’ supports

Interim Advice Note 91/07 (W) – Interim Advice on the Identification of ‘Particularly at Risk’ supports

22/07/11
This Interim Advice Note (IAN) provides guidance on the action to be taken if bridge supports that are deemed ‘particularly at risk’ are identified.
 
Interim Advice Note 86/07(W) - Amendments to design requirements for Portal and Cantilever Sign / Signal Gantries

Interim Advice Note 86/07(W) - Amendments to design requirements for Portal and Cantilever Sign / Signal Gantries

21/07/11
This Interim Advice Note (IAN) amends previous design criteria for portal and cantilever sign / signal gantries.
 
Interim Advice Note 85/07 (W) – Design of Passively Safe Portal Signal Gantries

Interim Advice Note 85/07 (W) – Design of Passively Safe Portal Signal Gantries

20/07/11
This Interim Advice Note (IAN) sets out the performance requirements for the design of passively safe portal signal gantries.
 
Interim Advice Note 83/06 (W) – Principal and General Inspection of Sign / Signal Gantries, and Gantries with Low Handrails or Open Mesh Flooring

Interim Advice Note 83/06 (W) – Principal and General Inspection of Sign / Signal Gantries, and Gantries with Low Handrails or Open Mesh Flooring

19/07/11
This Interim Advice Note (IAN) provides further advice on the inspection of gantries, addresses action needed where gantries have handrails lower than 1100mm, and provides measures to be taken where gantries have open mesh flooring.
 
Interim Advice Note 73/06 (W) Revision 1 (2009) – Design Guidance for Road Pavement Foundations (Draft HD25)

Interim Advice Note 73/06 (W) Revision 1 (2009) – Design Guidance for Road Pavement Foundations (Draft HD25)

18/07/11
This Interim Advice Note provides design guidance for road pavement foundations.
 
Interim Advice Note 70/06 (W) – Implementation of New Reinforcement Standards

Interim Advice Note 70/06 (W) – Implementation of New Reinforcement Standards

17/07/11
This Interim Advice Note provides guidance on the implementation of revised British Standards for steel reinforcement in concrete.
 
Interim Advice Note 64/05 – Driver Information Signs at Road Works

Interim Advice Note 64/05 – Driver Information Signs at Road Works

16/07/11
This Interim Advice Note (IAN) sets out the Agency’s policy relating to Driver Information Signs at road works that require the closure of a lane or hard shoulder.
 
Interim Advice Note 56/04 - Maintenance of Traffic Signs with Dew Restraint Coatings

Interim Advice Note 56/04 - Maintenance of Traffic Signs with Dew Restraint Coatings

15/07/11
This Interim Advice Note (IAN) provides advice about maintenance procedures for traffic signs with surfaces incorporating factory applied dew resistant coatings.
 
Interim Advice Note 53/04 – Concrete Half-Joint Deck Structures

Interim Advice Note 53/04 – Concrete Half-Joint Deck Structures

14/07/11
This Interim Advice Note (IAN) implements an Interim Management Strategy for reinforced concrete and steel/concrete composite half-joint deck detailing in suspended span and propped-cantilever bridges.
 
Interim Advice Note 49/03 – Use of Warning Signs for new Asphalt Road Surfaces

Interim Advice Note 49/03 – Use of Warning Signs for new Asphalt Road Surfaces

13/07/11
This Interim Advice Note provides information about the use of warning signs in connection with the skid resistance of new asphalt surfaces.
 
Interim Advice Note 48/03 – Measures to minimise the risk of sulphate attack (including thaumasite) in new construction and structures under construction

Interim Advice Note 48/03 – Measures to minimise the risk of sulphate attack (including thaumasite) in new construction and structures under construction

12/07/11
This Interim Advice Note (IAN) provides information for the design and construction of buried concrete to minimise the risk of sulphate attack.
 
Interim Advice Note 47/02 – Post-Tensioned Grouted Duct Concrete Bridges

Interim Advice Note 47/02 – Post-Tensioned Grouted Duct Concrete Bridges

11/07/11
This Interim Advice Note provides information for the design, construction and repair of post-tensioned concrete structures.
 
Interim Advice Note 41/02 – European Cement Standards

Interim Advice Note 41/02 – European Cement Standards

06/07/11
This Interim Advice Note (IAN) details changes in current cement standard requirements due to the publication of a new European Standard.
 
Interim Advice Note IA.5 – The Design of Concrete Highway Bridges and Structures. Use of BS 5400: Part 4: 1990.

Interim Advice Note IA.5 – The Design of Concrete Highway Bridges and Structures. Use of BS 5400: Part 4: 1990

05/06/11
This Interim Advice Note (IAN) introduces technical amendments to BS 5400: Part 4:1990 which are necessary to meet the Welsh Government’s requirements.
 
Interim Advice Note IA.4 – The Assessment of Concrete Highway Bridges and Structures

Interim Advice Note IA.4 – The Assessment of Concrete Highway Bridges and Structures

04/06/11
This Interim Advice Note introduces technical amendments to BD 44/95 and includes corrections to typographical errors and omissions in the Standard.
 
Interim Advice Note IA.3 – Post-tensioned Concrete Bridges, BA 50/

Interim Advice Note IA.3 – Post-tensioned Concrete Bridges, BA 50/93

03/06/11
This Interim Advice Note (IAN) provides additional advice to BA 50/93 in the light of findings from the initial stages of the programme of special inspections of post-tensioned concrete bridges, and the lessons learnt from the reports received.
 
Interim Advice Note IA.1 – Scheme Assessment Reporting Procedures

Interim Advice Note IA.1 – Scheme Assessment Reporting Procedures

01/06/11
This Interim Advice Note (IAN) is intended to clarify scheme assessment reporting procedures following some misunderstandings that developed regarding TD 37/93.