A45

A45 is a designation used for roadways in several countries, and it does not refer to a single, universal route. The A45 designation typically marks a long-distance or important road within a national or regional network, and its exact status (such as a national road, primary route, or Autobahn) varies by country.

In the United Kingdom, the A45 refers to a major road in England designated as an A road. It runs roughly east–west across central England and serves as a link between urban centers and rural areas, intersecting with other major routes along its course. The road handles a mix of through traffic and regional travel, and sections of it have been upgraded or bypassed over time to improve throughput and safety.

In Germany, Autobahn 45 (A45) is a long-distance motorway commonly known as the Sauerlandlinie. It connects the Ruhr area near Dortmund with southern sections of Hesse, passing through the Sauerland region and serving as a significant cross-country corridor in central Germany. As an Autobahn, it is part of the national high-speed road system and typically features controlled access and higher speed limits.

Because the A45 designation is used in more than one country, the precise route, length, and status can differ. The term is most relevant to discussions of road networks, transport planning, and travel navigation, where distinguishing between national A roads and international Autobahns is important.