The Bump Integrator test is a standardized method used to quantify the longitudinal surface roughness and riding quality of road pavements. The test utilizes a vehicle-mounted mechanical/electronic roughness measuring device, known as a bump integrator, which records the cumulative vertical displacement caused by surface irregularities as the vehicle traverses the pavement at a controlled speed.

The instrument measures the relative movement between the vehicle axle and chassis, which corresponds to surface undulations, bumps, and depressions present along the pavement. The recorded output is typically expressed in terms of Unevenness Index (UI) or roughness values over a defined length of roadway.

The Bump Integrator test is extensively used for:

• Assessment of pavement riding comfort
• Monitoring surface deterioration over time
• Prioritization of maintenance and rehabilitation works
• Correlation with pavement performance and user perception