Add project files.

Assets/Scripts/BuildingSystem/NodePlacer.cs

@@ -0,0 +1,29 @@
+using UnityEngine;
+
+public class NodePlacer : MonoBehaviour
+{
+    [SerializeField]
+    private GameObject nodeObject;
+
+    [SerializeField]
+    private TrafficNode prevPlacedNode;
+
+
+    void Update()
+    {
+        if (Input.GetKeyDown(KeyCode.B))
+        {
+            Vector3 newPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
+            newPosition.z = 0;
+            TrafficNode newNode = Instantiate(nodeObject, newPosition, Quaternion.identity).GetComponent<TrafficNode>();
+
+            if (prevPlacedNode != null)
+            {
+                prevPlacedNode.AddNextNode(newNode);
+
+            }
+            prevPlacedNode = newNode;
+
+        }
+    }
+}

Assets/Scripts/BuildingSystem/NodePlacer.cs.meta

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+fileFormatVersion: 2
+guid: 4da8003edf1936e4b9a1af5a937c1074
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: