A pill-crushing apparatus includes first and second arms having axially offset proximal and distal ends. The population of cells are of a sheet-like form and are assembled with a relatively thin flexible pliable carrier composed of a non-toxic flexible composition which substantially dissolves at body temperature to form a graft. Also, a selector is located on the document, the selector being positioned relative to a predefined point on the document. The processor includes logic to compare the state of rotation of the first vehicle tire to the state of rotation of the second vehicle tire, and determine from the comparison, the type of rumble strip in contact with at least one of the first vehicle tire and the second vehicle tire.