reading the hidden concepts in the text of tehran highways walls

because of the dispersion of activities in big cities, employing highways as the most important connecting way is indispensable. in today world, highways are connection arteries of cities transporting people to their social activities. because of continual use of highway, their walls prepare a context for conveying many social, cultural, economic, etc concepts. that is why most economic promotions,communication of social concepts and cultural teachings are provided on highways walls and margins.in few recent years, given the same potential, highway walls has created a site for appearance of street art. street art is demonstration of author’s personal signs on the walls and public places of the city and public audience decode the concepts embeded in the text of that art. currently tehran municipality, in a general policy, tried to spread and pay attention to street art particularly in the highways contexts. in this paper, we classify these designs on tehran highway walls while indicating present examples and interpret the concepts lying in these designs from a semiotic view point.