By Fernando Cabrera Diaz May 11, 2010 An ad hoc tribunal under UNCTIRAL Rules has awarded German investor Walter Bau AG more than 30 million Euros in its claim against Thailand over a tollway concession gone sour.  The tribunal found that the failure of Thai authorities to approve toll hikes as contemplated in the concession … Sigue leyendo German investor awarded 29 million Euros in claim against Thailand over highway concession