PARIS — Two European Uber executives are facing the possibility of prison in a French trial hinging on the ride-hailing service’s lowest-cost service.

While that service has already been banned in France, the trial that started today reflects larger tensions in Europe about how to regulate new technologies that offer consumers greater options but threaten traditional industries.

The trial comes a week after France’s top constitutional authority upheld a 2014 law banning the low-cost UberPop service, which allowed any driver without a professional license to drive passengers around for a fee. Uber’s standard app-based service, which involves registered drivers, remains legal in France.

Uber France chief Thibaud Simphal and its general manager for Western Europe, Pierre-Dimitri Gore-Coty, face up to two years in prison and fines of $337,000. They were ordered to stand trial on behalf of the San Francisco-based company on charges including “deceptive commercial practices” and complicity in illegal activities.