What would be really easy and flexible would be to tag u_turn=no on a node.
This would mean that this node is not allowed to take part in a u_turn manouver either as part of a from a to or a via. Since most traffic light intersections seem to be all 4 way no u_turn, all we need is one tage on each entry nodes to an intersection. Intersection that differ from this would be tagged on an individual basis.
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