References
HELLER realizes around 150 projects for its customers every year. For 25 years, its clients have included not only the Federal Government but also individual federal states or municipalities with their administrations in Germany and the responsible administrative units of other countries in Europe.
International
Switzerland: Amt für Strassen ASTRA
Austria: ASFINAG Autobahnen- und Schnellstraßen-Finanzierungs-Aktiengesellschaft
Poland: Instytut Badawczy Drog i Mostow, Warszawa und Zarząd Dróg Wojewódzkich w Katowicach
France: TÜV Rheinland France
Morocco: Autoroutes du Maroc
Portugal: Infraestruturas de Portugal