From March 1989 to November 1991, he served in the Canton of Aargau legislature. In 1991, he was elected to the National Council, representing the canton of Aargau, and since 1995 he has been the head of the Commission for Transport and Telecommunications. Until mid-1996, he was a member of the Freedom Party of Switzerland. Since then, Giezendanner has been a member of the Swiss People's Party.
Giezendanner supported the expansion of the Baregg tunnel (a bit of a bottleneck in the Swiss motorway network) in 2003, and the adding of a second tube of the Gotthard road tunnel. He currently is an advocate of the creation of a Formula 1 circuit course in Switzerland. The federal government's policy of shifting the heavy transit traffic to rail, has been the cause of criticism of Giezendanner, because of his work on the Baregg tunnel and on the Gotthard road tunnel.
He's a member of a Campaign for an Independent and Neutral Switzerland.
- "Giezendanner Ulrich - - Kanton Aargau" [Biography of Ulrich Giezendanner]. website of the Swiss Parliament. (in German and English). Berne: The Swiss Parliament. Retrieved February 1, 2011.
- ASIN Bulletin, Élections fédérales 2015: 43 membres de l'ASIN à Berne, n°178, december 2015, p.3
- "www.giezi-rothrist.ch" (in German). Rothrist. November 14, 2010. Retrieved February 1, 2011.Translate the German to English