Abstract: A wheel sensing treadle of high sensitivity includes a thin membrane strip having a top non-conductive membrane and a bottom non-conductive membrane, the membranes being generally parallel, spaced apart, and of extended length. A large number of switches are closely positioned along the length of the membranes. Each switch includes two thin conductive contacts formed respectively on each membrane by printing with conductive ink. A similarly-printed electrical lead connects respectively to each the switch contacts. The membrane strip is sandwiched between a rigid base and a resilient cover to form a treadle of extended length. The switch contact leads are connected in an X Y matrix, each switch having one contact connected to an X line and the other contact of the switch connected to a Y line of the matrix whereby each switch in the treadle has a unique X, Y address and can be rapidly an repetitively scanned by a computer.