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Berlinka (Russian:Берлинка) is the informalPolish and Russian name given to sections of the unfinishedReichsautobahn Berlin-Königsberg, which was a pre-World War II GermanReichsautobahn project to connectBerlin withKönigsberg inEast Prussia. In the late 1930s, the sections near these two cities were finished, but not the larger section in between. The German demand in 1939 to run this road across thePolish Corridor with extraterritorial status and Poland's refusal to allow this were used by Nazi Germany as a pretext to start a war. During the war, the Germans did not continue construction on a large scale and the route was never built. After the war, theGerman Democratic Republic, thePolish People's Republic and theSoviet Union'sKaliningrad Oblast inherited the remnants.

Eastern Prussia had been separated from Germany following theTreaty of Versailles by thePolish Corridor of theSecond Polish Republic. By 1939, Poland had already refused demands made by Nazi Germany, including one for anextraterritorial corridor within the Polish territory. This fact was eventually used byAdolf Hitler as one of the pretexts for theGerman invasion of Poland in 1939.
The road was planned under theWeimar Republic, but was partially constructed during the 1930s and early 1940s by theThird Reich.
Following territorial changes made afterWorld War II it ran through three countries: theSoviet Union'sKaliningrad Oblast (today anexclave of the same name, inpost-1991Russia), Poland, and what had beenEast Germany throughto October 1990. Its original purpose gone, some segments of the road were incorporated into local road networks while most of it fell into disrepair. The border between the Kaliningrad Oblast and Poland was completely sealed to civilian traffic during the Cold War, given the high density of Soviet military installations in that area, which ensured the Berlinka section in that area saw almost no use. The border between Poland and East Germany was open to civilian traffic but the economies of the two countries were not well connected and auto traffic between them was not significant for many decades. Given these conditions, some segments of Berlinka became a minor tourist attraction in the years after the war, as an example of a Nazi-built autobahn preserved in an almost pristine state, carrying very little or no traffic. A number of movies made in Poland and the USSR that were set in Germany had theirautobahn scenes shot on Berlinka sections. A popular Polish book and television series aboutPan Samochodzik had a high speed car chase that was set on Berlinka (as at the time one of the few places in Poland where a high speed car chase was even plausible, given the execrable condition of other roads). In recent years that attraction has diminished as most of the stretches completed in the 1930s have been reconstructed to modern standards and largely lost their original appearance. Today the last remaining stretch in Poland that still has Nazi era construction features is signed as voivodeship road 142, north-east ofSzczecin. As that stretch is only a local road, it is unlikely to be rebuilt in the foreseeable future. On the Russian side, the remains of the old road are still visible (54°31′35″N20°17′01″E / 54.5264296°N 20.2836840°E /54.5264296; 20.2836840) next to theE28 highway from thePolish-Russian border to the ring road of the city of Kaliningrad.
Along with constructing the motorway, after invading Poland, the Germans also quickly upgraded the main road going to East Prussia, in places paving it with concrete. Even though it is only a single carriageway road and not a motorway, it is also considered to be a part of the Berlinka's route. This section includes one interestingcloverleaf interchange (54°02′54″N18°45′40″E / 54.04836°N 18.7610°E /54.04836; 18.7610) some 34.5 kilometres (21.4 miles) south-southeast ofGdańsk, and a large bridge over theVistula south ofTczew (54°03′07″N18°49′00″E / 54.05205°N 18.81676°E /54.05205; 18.81676).

Construction began in late 1933, using unemployed German workers as part of the state's reforms to counteract theGreat Depression, the construction of theReichsautobahn (RAB) network. The first 113 kilometre (70 mile) long segment near Stettin (now Szczecin), Stettiner Dreieck to Stettin-Süd, was opened on September 27, 1936. The segment fromKönigsberg to Elbing (nowElbląg) was opened in 1937. In 1937,beltways near Stettin and Elbing were built.
In 1938, work slowed as Germany geared up forwar, and workers were directed to other projects. The highway featured prominently in Nazi political rhetoric of 1939, asHitler's demands included anextraterritorial corridor—theDanzig Corridor through thePolish Corridor—which would connectGermany toEastern Prussia. This, alongside other demands, was refused by the Polish government, and Hitler used this as one of the pretexts for theinvasion of Poland in September 1939.
By October 1939,Poland was defeated, and work on the Berlinka resumed. The labour pool was increasingly composed ofconscript workers from Poland. TheBäderstraße (nearRzęśnica andWielgowo) to Stargard-Massow (nearŁęczyca) segment was built subsequently. Construction stopped in 1942, as military priorities once again took over available labour. In 1945, German forces, retreating along theEastern Front, blew up most of the bridges to slow theSoviet advance.
Because ofterritorial changes of Poland andGermany following the war, the road was divided and lost its importance as a route between German cities (most of Prussia's German population was expelled to Germany). The part that remained within German borders became theBundesautobahn 11 after reunification.
Certain segments of the route were nonetheless restored. In thePolish People's Republic, bridges over theOder River near Szczecin were restored soon after the war, as were the bridges on theBanówka River near the border with the Kaliningrad Oblast. In the 1970s, the planned part of the highway from Maszewo (near Łęczyca) toChociwel was finished, and bridges on theIna River restored.
With the end of theCold War, and particularly with Poland joining theEuropean Union, increasing thought has been given to reconstructing the road as part of the European highway system. In the 1990s, a 14 kilometre (8.7 mile) long segment near the western Polish border was incorporated into the newA6 Autostrada (highway). A further 7 kilometres (4.3 miles), to the junction withNational Road 10, was being restored and was scheduled to open for traffic in August 2007. An additional 8 kilometres (5.0 miles) is to be upgraded at some future date and redesignated as part of the A6. The section between Elbląg and the border with Russia was completely reconstructed and opened as an express road,S22, in September 2008. In the course of the upgrade, the new modern carriageway was built in the space left for the second carriageway during original construction. At the same time, the original concrete carriageway was demolished almost along the entire length of the route, and only a few traces of it remain. All of the remaining original overpasses and bridges were demolished and replaced with modern works. Thus very few traces of the original German autobahn can be seen. Other part of theBerlinka are incorporated intovoivodeship road 142, andexpressroad 6/3. In the Russian Kaliningrad Oblast, it is incorporated into road P516.
As the original road was designed over 80 years ago, it would make little sense today to run a modern motorway along the same route as factors affecting road design changed greatly. Currently the road in Poland which will serve most of the route along which the Berlinka runs will be theS6 Expressway, set to the north of the Berlinka's route, closer to the Baltic coast and running from Szczecin to Gdańsk.