Abstract: A cluster of thrust rods are disposed in a module oriented to extend somewhat beyond the surface of a road or trackway adapted to receive vehicular traffic thereon, the thrust rod fastened to reciprocate in the presence of vehicular traffic and spring biased to return the thrust rod to an original, unstressed position. Each deflection of an associated thrust rod causes a fluid contained within a hydraulic piston/cylinder to be pulsed in response to pressure formed from a piston associated with the thrust rod, the thrust rod operating against spring tensioning to return to its unstressed state. Each fluid pulse is allowed to communicate through a single fluidic line to a second piston/cylinder arrangement having reduced cross section for a pulse of greater intensity and deflection, and spring biased to return to an original, unstressed position simultaneously with the thrust rod.