The double-mass system has higher reproducibility and gives a more accurate result on pavements built on soft soils. The double-mass system essentially produces a longer loading duration that more precisely represents a wheel load. The principle is based on the law of conservation of momentum with an elastic collision of two unequal masses. In the double-mass system, the weight drops onto a double-buffer system, which includes a first buffer, a second weight, and a second buffer. The load force is transferred through the plate, and the plate creates a deflection that simulates a wheel load. In a single-mass system, a weight is dropped onto a single buffer connected to a load plate, which rests on the surface being tested. Dynatest, Sweco - former Carl Bro, PaveTesting) and double-mass (KUAB). There are two different types of load impact systems single-mass (e.g.
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