From 1949 until his death he was a member of the Bundestag for the constituency of Hamburg-Harburg. From 20 September 1949 until 30 November 1966 he also served as Federal Minister for Transport, firstly under Chancellor Konrad Adenauer, who forced him to join the CDU in 1960 as he wouldn't support the DP any longer; then under Ludwig Erhard, under whom he ultimately, but briefly, served as Vice-Chancellor. Seebohm was a firm supporter of the Bundesbahn, and went to some length to hamstring the trucking industry.[2] In April 1953, second trailers were prohibited. In 1954 a law was passed dictating that half of all transports in Germany had to be carried by train; this would be promoted by subventioning rates for train transports. Trucking remained popular, however, due to its higher flexibility.[3] Thus, in 1956, the rules were tightened yet more: Sunday truck traffic was prohibited, along with a host of other new restrictions. Trucks were restricted to a 24-tonne (53,000 lb) GVW, with a maximum axle load of 8 tonnes (18,000 lb), and a maximum overall length of 14 metres (46 ft).[4] A minimum power-to-weight requirement of 6 PS/tonne (max 373 lb/hp) was instituted. These various restrictions forced truck manufacturers to develop entirely new trucks meeting the ever tightening requirements, and had a detrimental effect on exports.[4] In 1960 an easing of the restrictions was announced; railroad and trucking transport were now working in conjunction. Paradoxically, meeting the tough restrictions had forced the German trucking industry to become lean and innovative, leaving them in a much stronger position than before Seebohm's programs.[5]
When the 1966 grand coalition under Chancellor Kurt Georg Kiesinger took office, he left the cabinet, having served as a federal minister for seventeen years, a record beaten only by Foreign Minister Hans-Dietrich Genscher's 23 years (with an interruption in 1982) but as of 2011 still the record for uninterrupted service.
^Gräf, Holger (2017). "Willkommen im Wohlstand" [Welcome to Prosperity]. Historischer Kraftverkehr (in German). No. 3 (June/July). Cologne, Germany: Verlag Klaus Rabe. p. 7. ISSN1612-4170.
Speaker:Theodor Heuss until 12 September 1949; Hermann Schäfer until 10 January 1951; August-Martin Euler until 6 May 1952; Hermann Schäfer from 6 May 1952
Dorls (from 13 December 1950 WAV-Gast, from 17 January 1951 WAV, from 26 September 1951 Non-attached, am 23 October 1952 Mandatsaberkennung)
Frommhold (from 7 September 1949 Nationale Rechte, from 5 October 1950 Non-attached (DRP), from 26 March 1952 DP-Gast, from 11 February 1953 Non-attached)
Jaeger (from 29 February 1952)
Miessner (from 5 October 1950 FDP-Gast, from 20 December 1950 FDP)
Rößler (from 15 September 1949 Nationale Rechte, from 6 September 1950 Non-attached, from 13 December 1950 WAV-Gast, from 17 January 1951 WAV, from 26 September 1951 Non-attached, until 21 February 1952)
Thadden (from 15 September 1949 Nationale Rechte; 1950 DRP, from 20 April 1950 Non-attached)
Ott (Non-attached, from 4 May 1950 WAV-Gast, from 13 October 1950 BHE/DG, from 21 March 1952 Non-attached, from 26 March 1952 DP/DPB-Gast, from 26 June 1952 Non-attached)
Berg (from 27 June 1955, from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Blank (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Blücher (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Euler (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Fassbender (from 18 November 1955 DP, from 14 March 1957 DP/FVP)
Henn (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Hepp (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Hoffmann
Hübner (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Luchtenberg (from 18 September 1954, until 9 April 1956)
Lüders
Manteuffel (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Neumayer (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Onnen
Pfleiderer (until 20 September 1955)
Preiß (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Preusker (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Rademacher
Reif
Schäfer (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Schneider (from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Speaker: Horst Haasler until 15 March 1955; Karl Mocker 15 March 1955 till 26 April 1956; Erwin Feller from 26 April 1956]]
Members:
Bender (from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)
Eckhardt (from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)
Elsner
Engell
Feller
Fiedler (until 13 October 1953)
Finck (from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)
Finselberger
Gemein
Gille
Haasler (from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)
Keller
Klötzer
Körner (from 12 July 1955 Non-attached, from 14 July 1955 FDP, from 23 February 1956 Non-attached, from 15 March 1956 Demokratische Arbeitsgemeinschaft (DA), from 26 June 1956 FVP, from 14 March 1957 DP/FVP)
Kraft (from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)
Kunz
Kutschera
Meyer-Ronnenberg (from 20 August 1954 CDU/CSU)
Mocker
Oberländer (from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)
Petersen
Reichstein
Samwer (from 15 October 1953, from 12 July 1955 Non-attached, from 14 July 1955 Group Kraft/Oberländer, from 15 July 1955 Guest of CDU/CSU-Fraktion, from 20 March 1956 CDU/CSU)