diff --git a/.gitignore b/.gitignore
index 89056ef..88e1446 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,13 @@ __pycache__/
 *.py[cod]
 *$py.class
 
+# data
+data/trafficflow/PeMS03
+data/trafficflow/PeMS04
+data/trafficflow/PeMS07
+data/trafficflow/PeMS07(M)
+data/trafficflow/PeMS08
+
 # C extensions
 *.so