diff --git a/CHANGELOG b/CHANGELOG
index 81ff9542506469619bc3a6375abbc03a25003d1e..682c708038190d2cf5f6953f1e826d06b9a4fc0f 100755
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,8 @@
+1.0.6
+    2021/XX/XX
+
+    - Avoid to create static R-LINE files if the file already exist
+
 1.0.5
     2020/12/09
 
diff --git a/environment.yml b/environment.yml
index 584e815d9fbd3e5843f104f8f1f0bbab6c8866e2..a32aac5fd301c024bf78134856ba1a520a84c12d 100755
--- a/environment.yml
+++ b/environment.yml
@@ -7,7 +7,7 @@ channels:
   - anaconda
 
 dependencies:
-  - python = 2
+  - python = 3
   - numpy
   - netcdf4 >= 1.3.1
   - python-cdo >= 1.3.6
diff --git a/hermesv3_bu/sectors/traffic_sector.py b/hermesv3_bu/sectors/traffic_sector.py
index 35e1e3015a240673397b673901880a2721add382..306e1459f56582c14a7baf59117dd3b1dec827ee 100755
--- a/hermesv3_bu/sectors/traffic_sector.py
+++ b/hermesv3_bu/sectors/traffic_sector.py
@@ -1557,7 +1557,8 @@ class TrafficSector(Sector):
 
             df_in = df_in.to_crs({u'units': u'm', u'no_defs': True, u'ellps': u'intl', u'proj': u'utm', u'zone': 31})
             if rline_shp:
-                df_in.to_file(os.path.join(self.output_dir, 'roads.shp'))
+                if not os.path.exists(os.path.join(self.output_dir, 'roads.shp')):
+                    df_in.to_file(os.path.join(self.output_dir, 'roads.shp'))
 
             count = 0
             for i, line in df_in.iterrows():
@@ -1604,7 +1605,8 @@ class TrafficSector(Sector):
 
             df_out.set_index('Link_ID', inplace=True)
             df_out.sort_index(inplace=True)
-            df_out.to_csv(os.path.join(self.output_dir, 'roads.txt'), index=False, sep=' ')
+            if not os.path.exists(os.path.join(self.output_dir, 'roads.txt')):
+                df_out.to_csv(os.path.join(self.output_dir, 'roads.txt'), index=False, sep=' ')
         self.comm.Barrier()
         self.logger.write_log('\t\tTraffic emissions calculated', message_level=2)
         self.logger.write_time_log('TrafficSector', 'write_rline_roadlinks', timeit.default_timer() - spent_time)