A vehicle floor tray is molded from a thermoplastic polymer sheet such that it has high shear and tensile strength, an acceptable degree of stiffness and a high coefficient of friction on its upper surface. An electrical heater includes heater segments that are associated with respective ones of the zones. The values of the mobility metric computed over a period of time quantify the overall mobility of the mobile device. The lactide monomer derivative has a bifunctional norbornene spiro lactide structure, spiro6-methyl-1,4-dioxane-2,5-dione-3,2\u2032-bicyclo2. The context analysis engine passes determined facts to the rules engine, which selects and asserts to the presentation engine rules based on the facts, and the presentation engine provides periodically updated guidance to the agent based on the rules asserted. A wet etch is performed to complete formation of the slot.