Trooz

Trooz () is a Walloon municipality of Belgium in Liège Province.
On July 1, 2012, Trooz had 8,432 registered inhabitants, of whom 4,199 were male and 4,233 female. The total area is 24.00 km² which gives a population density of 351 inhabitants per km².
Trooz is situated on the Vesdre River, and is part of the ("Groupement Régional Économique des vallées de l'Ourthe et de l'Amblève") regional grouping for economic purposes.
The municipality consists of the following sub-municipalities: Trooz proper, Forêt, Fraipont, and Nessonvaux.
Industrial heritage.
The municipality includes several surrounding hamlets including which is where, between 1904 and 1958, the Imperia company produced automobiles. The factory building survives. This building is one of two examples of test tracks on its roof. The other known roof test track is on the roof of the old Fiat factory in Turin, Italy.