Guidance for surveys for BV224b in 2007/08

Authorities are required to carry out a visual survey of a proportion of their unclassified road network (minimum 25% per year) using either a UKPMS Coarse Visual Inspection Survey (CVI) or an equivalent Detailed Visual Inspection survey (DVI). Visual surveys must be carried out in accordance with "Visual Data Collection for UKPMS", Volume 2 of the UKPMS User Manual.

Note that all inspectors carrying out visual surveys for BV224b and all Data Capture Device (DCD) software used to collect the data must be accredited in accordance with the current UKPMS accreditation procedures. Further information is available from the UKPMS Support Consultant, telephone 01483 304364 or see www.ukpms.com for further information.

It is the intention that any survey data collected on or after 1st April 2008, and used for BV224b, should have been collected by inspectors that have been accredited under the new UKPMS inspector accreditation scheme, set up by the UKPMS Steering Group. Full details of the accreditation scheme are available on the UKPMS web site.

Concrete or part-covered roads should be included in the visual survey for BV224b.

If DVI surveys are to be used as the basis for the survey, they should be converted to a "CVI-equivalent" survey using the current version of the UKPMS HMDIF Conversion Software, and processed as a CVI survey. The current version of the HMDIF Conversion Software is available from the UKPMS web site.

Where CVI and DVI results are combined, CVI data must not be mixed with unconverted DVI data.

From 2007/08, authorities are required to base their BV224b survey result on data for their entire (unclassified) network and the minimum survey coverage is 90%. All data used for the 2007/08 result must have been collected since 31 March 2004, and it should include at least 25% of data collected since 31 March 2007.

The intention in future years is that authorities should continue to maintain a database covering the entire unclassified network, and update this by a fresh survey (minimum 25% per year).

Note that the cross sectional position (XSP) level used for any section should remain consistent over the four year cycle. Data should not be collected using a mixture of Minimal and Full XSPs for the same section.

Data should be processed using a UKPMS system accredited by the UKPMS Annual Health Check to produce BVPI 224b for 2007/08 and configured using UKPMS Rules and Parameters 8.01*. The processing should use variable length processing and default inventory. Users of Tranche 3 accredited systems should note that, at this stage, condition projection is not required to be used.

BV224b Calculation

The length of unclassified carriageway for which at least one of the UKPMS Rules and Parameters 8.01* Condition Index thresholds shown in the following table have been equalled or exceeded, divided by the total length of unclassified carriageway network. The indicator result should be expressed to the nearest whole percentage.

UKPMS RP8.01* Condition Index

Threshold Value

Structural CI

85

Edge CI

50

Wearing Course CI

60


Authorities should also provide the following information to support the BVPI:

  • UKPMS System & Version 
  • Version of Rules & Parameters Used 
  • Name of Inspector & Accreditation Date 
  • DCD Software & Version Used 
  • CVI or DVI Used? 
  • Reasons for reduced survey coverage (if applicable) 
  • Other Comments 

The details of the calculation that the software should perform to produce this PI report are contained in Part 2 of UKPMS Technical Note 38. The Technical Note can be obtained from the UKPMS website at www.ukpms.com.

* - UKPMS Rules and Parameters Version 8.01 will be the version of the UKPMS Rules and Parameters released to UKPMS Developers on 30 September 2007 for implementation by 31 December 2007. UKPMS Rules and Parameters Version 8.01 will form the basis of both the BVPIs for 2007/08 and the 2007 UKPMS Annual Health Check.