initial changes to crossings. Now not detected anymore as unusable switches

flatland/envs/observations.py

@@ -399,7 +399,12 @@ class TreeObsForRailEnv(ObservationBuilder):
                 break
 
             cell_transitions = self.env.rail.get_transitions(*position, direction)
-            total_transitions = bin(self.env.rail.get_full_transitions(*position)).count("1")
+            transition_bit = bin(self.env.rail.get_full_transitions(*position))
+            total_transitions = transition_bit.count("1")
+
+            # Check if crossing is found --> Not an unusable switch
+            if int(transition_bit, 2) == int('1000010000100001', 2):
+                total_transitions = 1
             num_transitions = np.count_nonzero(cell_transitions)
 
             exploring = False