An array of sensor devices, each sensor including a set of semiconducting nanotraces having a width less than about 100 nm is provided. Specifically, a first and a second reference pictures are provided, and motion estimation is conducted on the first and second reference pictures to generate motion vectors indicative of movement of at least one of the first and second reference pictures in relation to the other. The layer comprises a fibrous nonwoven fabric formed from fibrous andor filamentary elements, with the fibrous nonwoven fabric exhibiting a sufficiently reduced coefficient of friction and sufficient durability to absorb or distribute abrasive actions, while allowing passage of moisture, thus protecting the automotive surfaces against potentially detrimental environmental conditions.