If this is the concern, then it's a misplaced one, especially for streetcars. It's totally common in European cities for the busiest streets (with shops etc) to be exclusively lanes of recessed rail. Trucks have no problem delivering supplies; in fact, it looked a lot more pleasant than trying to weave in and out of traffic and hope to god loading area parking isn't blocked a la busy streets in US cities...

I'm suggesting closing the avenues during the daytime, especially rush hours. Deliveries and garbage pickup can happen early morning or in the evening (which is already the case for garbage pickup).