Introduction: The Street M-30 is a ”unique” street in the city of Madrid. The M-30 is a ring road of the city. A part of its layout, the Street M-30 is buried in the basement. The Street M-30 is a tunnel. The construction was controversial. Construction demanded solutions are not easy. At present is in a pathway of high traffic density. By its design, different in each of its sections, traffic density and the design demanded a very rigorous security system. In this article realizes the characteristics of this street.

Keywords: tunnel, technical characteristics, security systems;