Abstract-In this paper, we describe AL-S 2 m, a roadmap with traffic signs to be used in vehicular systems. AL-S 2 m is part of a more general system of traffic signs (TSs) management, called AL-S 2 , which includes two sides: central map server and client vehicular system. The server allows establishing, maintaining and disseminating AL-S 2 m. The client localizes the vehicle in AL-S 2 m and detects TSs. In this paper, we focus on the AL-S 2 m establishment. AL-S 2 m can handle variable TSs and its update is easy, which keeps it coherent with the reality. Also, it improves the map-matching algorithm. We implemented AL-S 2 m easily using an Android device.