"In technical terms,a prototype is often a functional,simplified experimental model of a planned component for a certain purposes. A prototype is often used as preparation for a series production. However, it can also be planned as a single piece to illustrate a particular concept. So,what will a prototype be felt like in the view from a moving car? "
find more details here
http://www.archiable.com/201102/20110228_sign_on_the_highway_bv_huibiao_wu.html