 Firstly it leaves Cologne, where it links with the E31, the E35, the E37 and the E40.It then heads south and crosses into Luxembourg, and into Luxembourg City, where more links are made to the E25, the E44 and the E125.It then re-enters Germany, more specifically the Saarland, running through the city of Saarbrücken, where it links with the E50 and the E422.