On the Place de l'Europe at Voiron, a plaque is a tribute to the European Union and shows the towns twinned with Voiron. This plaque is a gift from the stonecutter company Prévieux and was engraved as courtesy by Mr Roger Pilot. It was inaugurated in October 2004. Since then, Bulgaria, Romania and Croatia have joined the European Union and Droitwich Spa was twinned with Voiron.
To take these changes into account, the plaque was completed and the updated version was inaugurated on 10th November 2015 by the mayor of Voiron, Julien Polat, in the presence of the delegations of Bassano del Grappa (headed by Giovanna Ciccotti, Deputy mayor for Culture), of Droitwich Spa (headed by Roy Murphy, deputy mayor) and of the Kreis Herford (headed by Rolf Heemeier, Kreisdirektor).