Falling Weight Deflectometer / Heavy Weight Deflectometer (FWD / HWD) is a testing device used to evaluate the physical and mechanical properties of pavement.

The data is primarily used to estimate pavement structural capacity for:

• Dynamic E-moduli
• Remaining service life
• Critical layer(s)
• Overlay
• PCN values
• Load transfer (concrete)
• Seasonal strength variation
• Pavement strength influenced by temperature changes

Use includes (but is not limited to) highways, local roads, airports, ports and railways tracks. The FWD / HWD is designed to impart a load pulse to the pavement surface which simulates the load produced by a rolling vehicle wheel.