UKPMS Comparability Testing
Accredited UKPMS Systems
The 3 Tranches of UKPMS Functionality
· Tranche 1
· Tranche 2
· Tranche 3
Rules and Rule Sets
Feature Hierarchy
Best Value Performance Indicators
UKPMS Condition Surveys
· Coarse Visual Inspection
· Detailed Visual Inspection
· SCANNER Surveys
· Deflectograph
· Machine-Measured Rutting
UKPMS Location Referencing
· Section Referencing
· Chainage and Feature Referencing
· Cross Section Position Referencing
UKPMS Inventory

UKPMS Section Referencing

A road network comprises a spatially-located and uniquely-labelled set of sections of Highway, which act as the key for referencing other related data including inventory and condition. UKPMS Network Referencing at its simplest requires that the road network is referenced to a list of unique sections, with some means of deriving a direction (even if only in the description). Additionally, UKPMS provides the opportunity to introduce nodes, which unambiguously define direction, and connectivity between sections, but the use of these is determined by the user. It is strongly recommended however, that nodes are utilised on those parts of the network subject to machine survey.

Opposite sides of dual carriageways are defined as separate sections. The nominated section is the section to which shared items located within the central reserve (including the central reserve itself) are referenced.

Chainage and Feature Referencing

Within UKPMS sections, items are referenced to features (Carriageways, Footways, Cycletracks, Paved Verges and Kerbs) and then to start and end chainages within the section, recorded from the start of the section, and to “cross section position” (XSP) across the section.

Cross Section Position Referencing

There are two alternative methods of UKPMS cross?section position referencing, Full (Detailed) or Minimal (Simple), that can be used for defining the transverse location of a defects and inventory items, and which enable items to be assigned to physical bands across the width of the highway, e.g. a traffic lane, a footway, a verge.

The level of detail (or referencing model) to be used will be predetermined prior to surveying separately for the on and off carriageway features for each section, although in practice it is likely that a single method will be adopted for the whole network or survey, or at least for categories of road within a network. For example, it may be that the simple model is adopted for all unclassified roads.

Once the referencing model has been established for the carriageway and off-carriageway for a section, all data collection, including inventory must be collected using this model, with an exception for CVI data, which may be collected using the simple method where the full method would normally be used, provided that inventory data has already been collected.

All machine surveys, including SCANNER should use the “Full” XSP referencing method, so that the carriageway referencing method for sections where machine surveys are to be carried out should have their XSP referencing method as “Full”.

Left and right are implied by direction of referencing (as defined by start and end nodes or by section description). However, during a survey left and right are determined by the direction in which the survey is being carried out. If a survey has been carried out in the reverse direction, the software will automatically convert the data to the referenced direction when loading survey data to the UKPMS system.

For the minimal XSP method, the transverse location of a defect will be defined broadly by features. It is recommended that bus lanes, bus bays and lay-bys should be regarded as part of the carriageway with extra carriageway widths at these locations.

The Minimal cross section position codes are C (Carriageway), L (Left) or R (Right).

The Full XSP codes have a separate code for each lane and for each feature. Turning lanes and filter lanes are identified separately. The detailed codes are listed in the UKPMS Visual Survey Manual.

Produced by Chris Britton Consultancy Ltd on behalf of the UKPMS Owners Forum