See beneath the surface
Understand the full pavement structure, not just visible wear
Deflectograph Surveys
See beneath the surface to understand strength, lifespan, and structural priorities.
Structural Strength Insights You Can Act On
Deflectograph Surveys are conducted using a specialist vehicle that measures maximum deflection every 4 metres along each wheel path. By travelling slowly at 2.5 km/h, the survey captures close-spaced data that reveals even short sections of structural weakness.
Though measurements are taken at the surface, they reflect the deflection of all underlying layers-providing true insight into the pavement’s structural performance and future resilience.
Each survey delivers:
- Maximum surface deflection values at 4m intervals
- Detection of short structural weak spots
- Residual life estimates of full pavement structure
- Indicators of subgrade movement and condition
- Data to inform overlay thickness and strengthening design
- Network-level and project-level outputs
Build Long-Term Confidence
Go Beyond the Surface
A smooth road doesn’t always mean a strong one. Deflectograph Surveys measure structural strength by detecting how the road deflects under a known load. This allows authorities to understand the condition of every layer of the pavement-surface, bound layers, and subgrade-so they can plan strengthening works proactively and cost-effectively.
Used for over 30 years across the UK, this method remains essential for identifying weakness, forecasting residual life, and building accurate long-term maintenance strategies.
Related Condition Surveys
-
Bespoke Condition Surveys
Combine structural insights with other data types for a holistic asset view
-
RAV Surveys
High-speed surface condition data with cracking and rutting analysis
-
Visual Surveys
Structured manual inspections to capture surface-level faults and asset features
Why WDM?
With decades of experience delivering Deflectograph Surveys to national and local networks, WDM provides more than just data-we deliver confidence. Our team of experienced operators, engineers, and data specialists help you interpret results, design treatments, and embed strength data into long-term strategies.
Whether you’re maintaining heavily trafficked roads or planning future resurfacing works, WDM’s structural data helps you act decisively.
Talk to a Deflectograph Specialist
Whether you’re assessing structural capacity, forecasting lifespan, or planning overlay treatments, our team can help you interpret the data and shape the right strategy.
