Induced Traffic Appraisal

This guidance is now available at www.webtag.org.uk

The detailed advice for analysts is provided as four TAG units:

VDM Preliminary Assessment Procedures (TAG Unit 3.10.1) that defines criteria to enable analysts to decide whether the effects of variable demand seriously undermine the justification for their scheme;
VDM Scope of the Model (TAG Unit 3.10.2) gives the guidance required to specify the scope of a variable demand model;
the form of variable demand mechanisms and the circumstances when they are suitable to be used are described in VDM Key Processes (TAG Unit 3.10.3);
VDM Convergence Realism and Sensitivity (TAG Unit 3.10.4) sets out appropriate convergence standards together with the required realism and sensitivity tests needed to provide evidence about the robustness of the model

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Air Quality

Revised guidance for air quality assessments. Downloadable air quality spreadsheets available.

Highways Agency Accepted EN 1317 Compliant Road Restraint Systems

A list of products that the HA are aware have the required declaration of performance.

Road Restraint Assessment Process (RRRAP)

'Road Restraint Risk Assessment Process (RRRAP) 'Excel spreadsheet which enables designers to establish the need for a vehicle restraint and, if so, its performance requirements.

Safety Barriers

A study on the performance and cost effectiveness of median safety barriers installed on major roads.

Travel of Errant Vehicle Report

A report on how and where errant vehicles travel after leaving the carriageway.

Passively Safe Gantry Risk Model (PSGRM)

The PSGRM has been developed to help designers determine whether or not a passively safe gantry is suitable for a particular site.

Eurocodes

Information on preparations for the use of Eurocodes in the design of UK highway bridges and structures.

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