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| B 45 (Germany) | |
|---|---|
| Country | DEU |
| Route | 45 |
| Length km | 178 |
| States | Hesse, Baden-Württemberg |
| Terminus a | Sinsheim |
| Terminus b | Hanau |
B 45 (Germany) The Bundesstraße 45 is a federal road in Germany connecting Sinsheim in Baden-Württemberg with Hanau in Hesse. It traverses the Odenwald and links regional centres such as Heidelberg, Wiesloch, Darmstadt, and Frankfurt am Main-adjacent suburbs. The route forms part of regional transport corridors used by commuters, freight operators like DB Cargo, and regional planners from authorities such as the Bundesverkehrsministerium.
The road begins near Sinsheim close to the A6 interchange and proceeds north-east through Eppingen, skirted by connections to Heilbronn and Mannheim. It crosses the Odenwald with alignments near Buchen (Odenwald), Michelstadt, and Erbach (Odenwald), intersecting federal routes such as the A81 corridor via link roads and meeting state roads to Würzburg and Stuttgart. Entering Hesse, B45 passes through Lautertal, Reichelsheim (Odenwald), and near Darmstadt satellite towns like Weiterstadt before reaching the eastern terminus in Hanau, adjacent to connections toward Frankfurt am Main and the A3. Along its length the road interfaces with rail nodes served by Deutsche Bahn long-distance and regional services, including stations on the Rhine-Main S-Bahn network and the RheinNeckar S-Bahn.
The corridor follows historic trade links between the Upper Rhine plain and the Main region used since medieval times by merchants travelling between Speyer, Worms, Frankfurt am Main, and Nuremberg. In the 19th century the alignment was part of postal routes administered by the Kingdom of Württemberg and the Grand Duchy of Hesse. During the Weimar Republic and the subsequent post-war period the route was upgraded into a Bundesstraße to support reconstruction and the rise of motorised freight from industrial centres such as Mannheim, Darmstadt, and Frankfurt am Main. Cold War logistics and NATO planning increased strategic use of arterial roads linking bases near Rhein-Main Air Base and transit points toward the Frankfurt-Hahn Airport catchment. Modernisation in the late 20th century responded to traffic growth from companies including Daimler, SAP SE, and logistics firms operating around the Frankfurt Rhine-Main Metropolitan Region.
Significant upgrades have included bypasses around towns such as Buchen, Erbach, and Michelstadt to reduce town-centre congestion and improve safety following standards set by the Bundesanstalt für Straßenwesen. Interchange works at junctions with the A6 and A3 were coordinated with state ministries of Baden-Württemberg and Hesse and funded through federal investment programmes inspired by EU cohesion funding frameworks. Projects incorporated modern engineering techniques used by contractors including HOCHTIEF and Wayss & Freytag: road widening, grade-separated crossings, and noise-abatement walls responding to directives from the European Commission on environmental impact. Maintenance and resurfacing have been scheduled alongside rail upgrades by Deutsche Bahn to align multimodal corridor improvements.
B45 serves commuter flows between suburbs of Frankfurt am Main, Darmstadt, and Heidelberg and supports freight access to logistics hubs near Hanau and the Rhine ports at Mannheim. It provides resiliency for the national network when sections of the A3 or A6 are congested or closed due to incidents disrupting operators such as DHL and DB Schenker. Regional transit authorities including the Rhein-Main-Verkehrsverbund and the Verkehrsverbund Rhein-Neckar coordinate bus services along B45 corridors, integrating schedules with Frankfurt Airport connections and intercity rail timetables by Deutsche Bahn. The road also supports tourism to natural attractions like the Felsenmeer (Bergstraße) and cultural sites in Heidelberg and Hanau.
Major intersections include the junction with the A6 near Sinsheim, crossings with the B45 spur links to A81-oriented routes, and the connection to the A3 near Hanau. Other significant nodes occur where B45 meets federal roads such as the B27, B47, and B426, and where it interfaces with state roads toward Würzburg, Aschaffenburg, and Stuttgart. Railway-grade separations near Michelstadt and bypass interchanges at Erbach (Odenwald) manage high traffic volumes and integrate with local municipal networks such as those of Darmstadt-Dieburg and Main-Kinzig-Kreis.
Proposals under discussion by regional planning bodies include further bypasses to relieve town centres in Odenwaldkreis and capacity upgrades on bottleneck sections approaching Hanau to support growing freight demand to the Port of Mannheim and the Frankfurt Rhine-Main International Airport complex. Cross-jurisdictional projects coordinated by the Hessen Mobil and Landesbetrieb Straßenwesen Baden-Württemberg aim to incorporate active transport measures linking cycle networks promoted by the European Cyclists' Federation and to apply climate adaptation measures following guidance from the Intergovernmental Panel on Climate Change. Funding debates involve the Bundesverkehrsministerium, state parliaments such as the Landtag of Hesse and the Landtag of Baden-Württemberg, and EU infrastructure instruments.
Category:Roads in Hesse Category:Roads in Baden-Württemberg