A motorcycle has a muffler 40, a muffler cover 50 for covering a part of a side surface of the muffler 40 and an end cap 60 for covering the muffler 40 from a rear side thereof. The assembly includes a dwelling space having an outer wall. Provided implementations can also comprise a MEMS motion sensor housed in the package or enclosure. The signal processing system also includes a data exchange capable of exchanging data signals modulated by a voiceband carrier on the switched circuit network with unmodulated data signal packets on the packet based network. A retroreflective sheet used for a co-molding, comprising a metallic reflective layer, a microspherical lens layer disposed as a single layer, and a transparent focal resin layer disposed between the reflective layer and the microspherical lens layer, in which the focal resin layer comprises a mixture of cellulose ester and polyvinyl butyral resin.