diff --git a/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/Roadspaces2CitygmlTransformer.kt b/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/Roadspaces2CitygmlTransformer.kt
index f09e536..815d17f 100644
--- a/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/Roadspaces2CitygmlTransformer.kt
+++ b/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/Roadspaces2CitygmlTransformer.kt
@@ -31,7 +31,6 @@ import io.rtron.model.roadspaces.RoadspacesModel
 import io.rtron.model.roadspaces.identifier.opposite
 import io.rtron.model.roadspaces.roadspace.road.Lane
 import io.rtron.model.roadspaces.roadspace.road.LaneChange
-import io.rtron.model.roadspaces.roadspace.road.LaneType
 import io.rtron.std.getValueEither
 import io.rtron.transformer.converter.roadspaces2citygml.module.RelationAdder
 import io.rtron.transformer.converter.roadspaces2citygml.report.Roadspaces2CitygmlReport
@@ -220,10 +219,7 @@ class Roadspaces2CitygmlTransformer(
 
             // predecessor
             val predecessorLaneIds =
-                if (currentLane.type == LaneType.BIDIRECTIONAL) {
-                    roadspacesModel.getPredecessorLaneIdentifiers(currentLane.id).getOrElse { throw it } +
-                        roadspacesModel.getSuccessorLaneIdentifiers(currentLane.id).getOrElse { throw it }
-                } else if (currentLane.id.isForward()) {
+                if (currentLane.id.isForward()) {
                     roadspacesModel.getPredecessorLaneIdentifiers(currentLane.id).getOrElse { throw it }
                 } else {
                     roadspacesModel.getSuccessorLaneIdentifiers(currentLane.id).getOrElse { throw it }
@@ -241,10 +237,7 @@ class Roadspaces2CitygmlTransformer(
 
             // successor
             val successorLaneIds =
-                if (currentLane.type == LaneType.BIDIRECTIONAL) {
-                    roadspacesModel.getSuccessorLaneIdentifiers(currentLane.id).getOrElse { throw it } +
-                        roadspacesModel.getPredecessorLaneIdentifiers(currentLane.id).getOrElse { throw it }
-                } else if (currentLane.id.isForward()) {
+                if (currentLane.id.isForward()) {
                     roadspacesModel.getSuccessorLaneIdentifiers(currentLane.id).getOrElse { throw it }
                 } else {
                     roadspacesModel.getPredecessorLaneIdentifiers(currentLane.id).getOrElse { throw it }
diff --git a/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/module/TransportationModuleBuilder.kt b/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/module/TransportationModuleBuilder.kt
index de0e661..a314f89 100644
--- a/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/module/TransportationModuleBuilder.kt
+++ b/rtron-transformer/src/main/kotlin/io/rtron/transformer/converter/roadspaces2citygml/module/TransportationModuleBuilder.kt
@@ -30,6 +30,7 @@ import io.rtron.model.roadspaces.identifier.AbstractRoadspacesIdentifier
 import io.rtron.model.roadspaces.identifier.LaneIdentifier
 import io.rtron.model.roadspaces.roadspace.objects.RoadspaceObject
 import io.rtron.model.roadspaces.roadspace.road.Lane
+import io.rtron.model.roadspaces.roadspace.road.LaneType
 import io.rtron.model.roadspaces.roadspace.road.RoadMarking
 import io.rtron.transformer.converter.roadspaces2citygml.Roadspaces2CitygmlParameters
 import io.rtron.transformer.converter.roadspaces2citygml.geometry.GeometryTransformer
@@ -112,7 +113,12 @@ class TransportationModuleBuilder(
         relatedObjects.forEach { relationAdder.addRelatedToRelation(it, trafficSpaceFeature) }
         // TODO: consider left-hand traffic (LHT)
         trafficSpaceFeature.trafficDirection =
-            if (lane.id.isForward()) TrafficDirectionValue.FORWARDS else TrafficDirectionValue.BACKWARDS
+            when {
+                lane.type == LaneType.BIDIRECTIONAL -> TrafficDirectionValue.BOTH
+                lane.id.isForward() -> TrafficDirectionValue.FORWARDS
+                else -> TrafficDirectionValue.BACKWARDS
+            }
+
         // geometry
         val centerLineGeometryTransformer = GeometryTransformer(parameters).also { centerLine.accept(it) }
         trafficSpaceFeature.populateLod2Geometry(centerLineGeometryTransformer)