W.D.M. Limited operates a fleet of survey vehicles to provide safe, reliable and cost effective assessment of road conditions. This service, delivered by expert operators using an ISO 9001:2008 third party accredited quality system, is available worldwide.

It is ideal for those clients who do not wish to purchase their own vehicles, or for whom the capital and running costs are too great to justify. It is also an attractive option for clients who require limited road survey capacity, are still developing policy and/or wish to always have access to the latest equipment.

RAV / Scanner Surveys

Road Assessment Vehicles (RAVs) carry out high speed data acquisition and recording of road surface conditions, including automatic recognition of surface cracking. This gives performance indicators to enable maintenance work to be prioritised and National Indicators to be calculated.


Deflectograph Surveys

Highway Authorities have used Deflectograph Surveys for more than 30 years to indicate the strength of their asphalt roads. By measuring the condition of all road layers, not just those that can be seen at the road surface, it’s possible to define the backlog and long term budget requirements needed to maintain the structural integrity of highway networks.


Visual Condition Surveys

WDM® is a major provider of Coarse Visual Inspection (CVI) surveys to local authorities. Its large team of fully certified and experienced surveyors use software and vehicles specifically designed to collect visual data, without the need for walked surveys. 


SCRIM® Surveys

Helping to lower accident rates by identifying where there is a risk of wet-road skidding. The introduction of regular SCRIM® machine surveys, together with a skid policy based on the current standards, offers a very cost effective option for local authorities to achieve and maintain reductions in their road casualty rates.


Multi Function Road Monitor (MRM)

The new design for the MRM makes it ideal for undertaking objective repeatable road condition surveys on minor narrow roads and in towns and cities. The original MRM is the forerunner of the RAV road survey vehicle and records all SCANNER defects except road cracking.

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