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East portal with pedestrian tunnel and branch to airport bypass
Use two road tunnels,
one pedestrian tunnel
Transport connection National road 433
Location Hamburg-Fuhlsbüttel
Length 418,75 m
Number of tubes 3
Start of construction 1963
Completion 1965
Krohnstiegtunnel (Hamburg)
(53° 38′ 48,8″ N, 9° 58′ 43,9″O)
(53° 38′ 55,2″ N, 9° 59′ 4,5″O)
West portal 53° 38′ 49″ N, 9° 58′ 44″ E
East portal 53° 38′ 55″ N, 9° 59′ 4″ E

The Krohnstiegtunnel is a road tunnel in the course of the federal road 433 and the ring 3 under the runway 15/33 of the Hamburg airport.


The extension of the airport runway across the state border into Schleswig-Holstein in the 1960s cut the Garstedter Weg, the connection from Niendorf to Garstedt. The Krohnstiegtunnel was built as a replacement. It also improved road connections in the north of Hamburg. A new road, part of Ring 3, from the “Schnelsen-Nord” junction on the A 7 was built to the tunnel, which was extended to Langenhorn on the eastern side.

With the expansion of the airport from the 1990s and the construction of the Fuhlsbüttel bypass, the Krohnstiegtunnel was also extended. Between 1995 and 1998, a second tube was built to the north of the old road tunnel using the cut-and-cover method, so that two lanes are now available in each direction. The necessary demolition and reconstruction of the runway was carried out in only five months in order to disrupt flight operations as little as possible.


The original Krohnstiegtunnel consists of an approximately 419-metre-long and ten-metre-wide two-lane tube for road traffic and an adjacent six-metre-wide tube to the south for pedestrians and cyclists alone, the floor of which is slightly higher. The ramps on the sides have a length of 415 metres. The completion of the second tube for road traffic in 1998 gave the tunnel its current appearance.

The tunnel is a closed reinforced concrete frame. Like the entire airport area, which belongs to Hamburg, it is located in the district of Fuhlsbüttel. The western portal, on the other hand, is located in Niendorf, the eastern one in the territory of the city of Norderstedt.


  • Sven Bardua: Unter Elbe, Alster und Stadt. The history of tunnel construction in Hamburg. Dölling und Galitz Verlag, Munich and Hamburg 2011, ISBN 978-3-86218019-6, p. 94-96

Web links

Commons: Krohnstiegtunnel– Collection of images, videos and audio files