Stock Photo - 16 December 2019, Brandenburg, Teupitz: Black streaks on the A13 motorway can be seen on the areas of the carriageway where the so-called concrete cancer was repaired. The A13 had been rehabilitated in 2001. Because of the gravel-sand mixtures used in construction, holes formed on the roadways after a chemical reaction, which were rammed provisionally and in strips on some sections. Photo: Soeren Stache/dpa-Zentralbild/dpa. - Teupitz/Brandenburg/Germany

Stock Photo: 16 December 2019, Brandenburg, Teupitz: Black streaks on the A13 motorway can be seen on the areas of the carriageway where the so-called concrete cancer was.

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