Yes, as you saw a lot of no u turn signals where mapped as no left turn because that is what they mean, weird but is the way it is. The no_left_turn restriction solves it. The signals are confusing, the no_u_turn means that you cannot use http//www.openstreetmap.org/way/341551036 so the no left turns would model the real world. the same way is allowed to turn left NW while going NE, and crossing SE.

This is mapped as trunk because that is the defined criteria, but nowadays it is a slow avenue, a lot of pedestrians and old cars, motorbikes and bikes, a lot of traffic calming bumps, radars, traffic signals, so is better to try to avoid using it.