A surface profiler comprises at least one front support wheel and at least one rear support wheel for travelling along the surface of a profile to be measured, the rotational axes of said wheels being longitudinally spaced, and the wheels contacting the surface being profiled in a collinear manner. The seat is moved to the rear of a vehicle body in an initial stage of impact by the actuator. Control instructions or information may then be provisioned to network edge devices to alleviate congestion.