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This Guardian report claims that it was in fact Fleischstraße ('Flesh/Meat Street'), not Brotstraße ('Bread Street'), but other (German) reports I've seen describe it as the driver driving about a kilometre through the pedestrian zone (which includes both the above streets) covering Trier's Old City.
I can't imagine there won't be more deaths.
There'll be a press conference tonight that will probably bring more news, e.g. possibly about the motive.
Suspected terror attack in Trier
https://today.rtl.lu/news/world/a/1622769.html
Pretty close to me, in a normal year I'd have been there quite a few times.