1. A vehicle, comprising: a frame defining a passenger compartment; a vehicular component arranged in or defining part of said passenger compartment and having a plurality of positions relative to said frame; and a system for obtaining information about said component, said system comprising at least one reflective device arranged in association with said component; a detector for detecting waves reflected by said at least one reflective device; and a processor coupled to said detector for obtaining information about said component from the detected waves.