East along the city runs the B45 from north to south, a motorway-like street connecting all the urban districts with the motorway A3 and the cities of Offenbach, Frankfurt and Hanau to the north and Darmstadt to the south. The suburban railway no. 1 (German: "S-Bahn-Linie 1") runs to Offenbach and, since 2003 directly to Frankfurt. A poor bus system (a single line) connects the urban districts frequently. Rodgau can be easyly reached by street from most other parts of Germany. This was one reason for its fast development in the past.