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SCANNER acceptance testing and accreditation

To provide local authorities, and the Department for Transport, with confidence that SCANNER datasets are consistent and suitable for national performance monitoring, and to support local maintenance operations, a quality assurance procedure was developed and fully incorporated into the SCANNER specification. The specification defined quality assurance requirements including accreditation tests for all survey machines,

Since the end of the previous DfT contract in September 2010 SCANNER accreditation, Quality Assurance and Audit has been provided as a commercial service by TRL Limited. Further information about these changes is provided in a letter from the DfT to local authorities dated 6th June 2011 DfT letter on SCANNER QA arrangements

SCANNER accreditation testing process

Before a survey vehicle can be used to carry out a SCANNER survey, it must have a valid accreditation certificate, which is obtained by passing a stringent set of annual accreditation tests detailed in the SCANNER specification Volume 5 (LINK). It must also be operated with a defined quality assurance procedure as defined in the SCANNER specification Volume 4 SCANNER surveys for Local Roads User Guide and Specification Volume 4: Technical Requirements for SCANNER Survey Data and Quality Assurance 2011 and supervised by an independent Auditor (currently TRL).

The accreditation testing is carried out at a number of different levels:

* The site tests compare the individual parameters measured by the survey equipment against those measured by a reference method.

* The network tests assess the operational capabilities of the survey equipment (and survey crews) on one or more routes located on the public road network.

* The data output from the equipment is also checked to ensure that it complies with all the requirements for loading into a UKPMS accredited system.

If the equipment fails to achieve the required levels of accuracy in the measurement of individual parameters, the machine developer or survey contractor may seek to resolve this issue by enhancing the performance of the equipment and re-presenting for accreditation testing.

On successful completion of the tests a SCANNER Accreditation Certificate is issued by the Independent Auditor. This is valid for a twelve month period and to ensure continuous accreditation the vehicle may commence re-accreditation testing 10 months after the certificate started. The Auditor has the power to revoke (at any time) a SCANNER accreditation certificate if it believes the quality of the SCANNER data has been compromised.

Current accredited SCANNER survey vehicles


There are currently 11 accredited SCANNER machines operated by two companies, WDM Ltd, and Yotta. Information on accredited SCANNER devices including accreditation certificates are listed in the table below.

Displaying 1 - 10 of 22
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Title Type Published

Expires 20th May 2017...

SCANNER acceditation 14/11/16

Expires 7th August 2017...

SCANNER acceditation 14/11/16

Date of expiry 5th July 2017...

SCANNER acceditation 11/11/16

Date of expiry 15th July 2017...

SCANNER acceditation 11/11/16

Date of expiry 7th April 2017...

SCANNER acceditation 11/11/16

Date of expiry 18 July 2017...

SCANNER acceditation 11/11/16

This certificate will expire on 18 January 2017...

SCANNER acceditation 10/05/16

This certificate will expire on 10 October 2016...

SCANNER acceditation 10/05/16

This certificate will expire on18th November 2016...

SCANNER acceditation 10/05/16

This certificate will expire on 31 March 2016...

SCANNER acceditation 19/01/16
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Enquiries about SCANNER accreditation process should be addressed to either Alex Wright, Patrick Werro, or Christopher Torkington of TRL, or alternatively email

TRL Crowthorne House Nine Mile Ride Wokingham Berkshire RG40 3GA Tel: 01344 773131 Fax: 01344 770356