The Belgian Road Research Centre has a falling weight deflectometer to measure the temporary deflection of roads under heavy traffic loads. A falling weight is dropped from a standing vehicle onto a metal disc laid on the road surface. A rubber interface on top of the metal disc damps the impact so as to simulate the passage of a heavily loaded wheel axle of a lorry. Nine sensors in the vicinity of the impact zone record the temporary deflection of the road surface. A deflection bowl can be determined from the measured data. The FWD is suitable for measurements on all types of pavement (from flexible to rigid) and for use on road networks. Usually one measurement is performed every 100 m. A single measurement takes less than two minutes.
The Belgian Road Research Centre has a footway profilometer to measure the longitudinal evenness of cycle tracks and other surfaces. A scooter with a trailer travels at a constant speed of 20 km/h on the surface to be surveyed. Using a laser and an accelerometer, the distance between the trailer and the road surface is recorded every 3 cm. The GPS coordinates and the distance travelled are recorded as well. From the measured longitudinal profile is possible to calculate the coefficient of evenness (for wavelengths of 0.5 m and 2.5 m) or other indicators of evenness.
On January 28 and 29 2015, the Belgian Road Research Centre hosted a workshop on the Curviameter. The objective of the workshop was to bring together specialists and users of Curviameter measurement data: current and former end-users of Curviameter data, road managers and road engineers, scientists who published articles about the interpretation of Curviameter data, and persons interested in the measurement device and in the data it provides.