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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 12 accredited SCANNER machines operated by two companies, WDM Ltd, and Ginger-Lehmann (Yotta Surveying were acquired by Ginger-Lehmann in 2018. The survey devices are unchanged). Information on SCANNER devices including the latest accreditation certificates are listed in the table below. Earlier certificates can be found here.

Device Company Registration Expiry Certificate
Tempest 1 Ginger-Lehmann Y7TTA 07/05/20   Tempest1_2019_20_Certificate-Issue4.pdf
Tempest 3 Ginger-Lehmann FG12DCZ 12/06/20   Tempest3_2019_Certificate_Issue3
RAV 6 WDM W600RAV 18/07/20   RAV6_2019_Certificate-Issue11
RAV 7 WDM W700RAV 07/08/20   RAV7_2019_Certificate-Issue11
RAV 8 WDM W800RAV 16/09/20   RAV8_2019_Certificate-Issue11.pdf
RAV 9 WDM W900RAV 07/04/21   RAV9_2020_Certificate-Issue11.pdf
RAV 10 WDM W100RAV 07/04/20   RAV10_2019_Certificate-Issue10.pdf
RAV 11 WDM R11WDM 15/07/20   RAV11_2019_Certificate-Issue8.pdf
RAV 14 WDM R14WDM 24/11/20   RAV14_2019_Certificate-Issue6.pdf
RAV 15 WDM R15WDM 20/05/20   RAV15_2019_Certificate-Issue5.pdf
RAV 16 WDM R16WDM 11/03/21   RAV16_2020_Certificate-Issue2.pdf
Tempest4 Ginger-Lehmann LO68HWM 01/09/20 Tempest4_2019_Certificate_Issue1


Enquiries about SCANNER accreditation process should be addressed to either 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