Frankfurt is a traffic hub of the German motorway (Autobahn) system. The Frankfurter Kreuz is an Autobahn interchange close by the airport where the Bundesautobahn 3 (A 3), Cologne to W�rzburg, and the Bundesautobahn 5 (A 5), Basel to Hannover, meet. With approximately 320,000 cars daily it is the most heavily used interchange in Europe. The Bundesautobahn 66 (A 66) connects Frankfurt with Wiesbaden in the west and Fulda in the east. The Bundesautobahn 661 (A 661) is mainly a commuter motorway which starts in the south (Egelsbach), runs through the eastern part of Frankfurt and ends in the north (Oberursel). The Bundesautobahn 648 (A 648) is a very short motorway in the western part of Frankfurt which primarily serves as a fast connection between the A 66 and the Frankfurt Trade Fair. The A 5 in the west, the A 3 in the south and the A 661 in the north-east form a ring road around the inner city districts of Frankfurt and define a Low-emission zone (Umweltzone; established in 2008), meaning that vehicles have to meet certain emission criteria otherwise they are not allowed to enter the zone.
The streets of central Frankfurt are usually congested with cars during rush hour. Some areas, especially around the shopping streets Zeil, Goethestra�e and Fre�gass, are pedestrian-only streets, but there are numerous car parks located throughout the city and especially in the city centre.
Frankfurt Central Station (Frankfurt Hauptbahnhof, often abbreviated as Frankfurt (Main) Hbf or F-Hbf) is the largest train station in Germany by railway traffic. Regarding daily passenger volume it ranks second together with Munich Central Station (350,000 each) after Hamburg Central Station (450,000). It is located between the Gallus, the Gutleutviertel and the Bahnhofsviertel district, not far away from the trade fair and the financial district. It serves as a major hub for long-distance trains (InterCity, ICE) and regional trains as well as for Frankfurt's public transport
