The group had just passed though a section of road works controlled by traffic lights, forcing all traffic into the righthand lane.
At the end of the road works the group moved back to the left with the exception of Mr Zech.
To avoid an oncoming southbound 4WD, Mr Zech swerved but crashed.
Mr Zech died in hospital.
The German embassy was notified and was helping the family.
Mrs Zech was being supported by a travel manager, a group leader and the German insurance agency, and her family in Germany were making arrangements.
Police extend their thoughts and condolences to Mr Zech's family during this difficult time.