Similarly, the east-west routes use increasing numbers from north to south.
Individual road usage increased resulting in a relatively high traffic density to other nations.
Intercity bus service within Germany fell out of favour as post-war prosperity increased, and became almost extinct when legislation was introduced in the 1980s to protect the national railway.
After that market was deregulated in 2012, some 150 new intercity bus lines have been established, leading to a significant shift from rail to bus for long journeys., abbreviated BAB), which translates as "federal motorway".
The country's most important waterway is the river Rhine. Frankfurt Airport is a major international airport and European transportation hub.
Air travel is used for greater distances within Germany but faces competition from the state-owned Deutsche Bahn's rail network.
Only federally built controlled-access highways meeting certain construction standards including at least two lanes per direction are called "Bundesautobahn".