Klophaus was visiting professor at the Center for Transportation Studies of the University of British Columbia, Vancouver and was offered professorships in Trier (2000), Worms (2006, rejected) and Saarbrücken (2009, rejected).
Klophaus war Gastprofessor am Center for Transportation Studies der University of British Columbia, Vancouver, und erhielt Rufe an die Hochschulen in Trier (2000), Worms (2006, abgelehnt) und Saarbrücken (2009, abgelehnt).