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LIER-TRANSPOLIS has an international clientele. Clients are, in general, manufacturers, suppliers, developers or installers of road safety systems.

In addition to its work for the French industry, LIER-TRANSPOLIS performs many tests for international clients, in particular for European companies. This international activity is due to the specialist nature of the test centre and to recommendations from numerous official organisations responsible for the authorisation of the sale of new products and for the CE marking of products according to European standards.