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7 changes: 7 additions & 0 deletions osi_trafficlight.proto
Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,13 @@ message TrafficLight
//
repeated LogicalLaneAssignment logical_lane_assignment = 7;

// Shared group identifier for related bulbs.
//
// \note All bulbs belonging to the same signal unit share the identical \c #group_id .
// \note The id must be globally unique within a single ground_truth message.
// All traffic lights with identical \c #group_id form one logical traffic signal unit.
optional Identifier group_id = 8;

// Definition of semantic colors for traffic lights.
//
// \note The color types represent the semantic classification of a traffic light
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