An automatic traffic monitoring and guidance system is in place along the motorway. It consists of measuring, control and signalling devices located in zones where driving conditions may vary, such as at interchanges, viaducts, bridges, tunnels and zones where fog and strong wind are known to occur. The system uses variable traffic signs to communicate changing driving conditions, possible restrictions and other information to motorway users. The A2 motorway mainly runs through the plains and rolling hills of Hrvatsko Zagorje region, although the northernmost sections of the route traverse rugged terrain, requiring a number of viaducts and long tunnels along the route.