diff --git a/tm2py/acceptance/simulated.py b/tm2py/acceptance/simulated.py
index df931653..24322781 100644
--- a/tm2py/acceptance/simulated.py
+++ b/tm2py/acceptance/simulated.py
@@ -1073,6 +1073,8 @@ def _make_district_to_district_transit_summaries(self):
             right_on=["origin", "destination", "time_period"],
         )
 
+        s_df = s_df[s_df["time_period"] == "am"].copy()
+
         for tech in self.c.transit_technology_abbreviation_dict.keys():
             column_name = "simulated_{}_flow".format(tech.lower())
             s_df[column_name] = (