diff --git a/persontracking/algorithms.py b/persontracking/algorithms.py
index a968b14..8c1461a 100644
--- a/persontracking/algorithms.py
+++ b/persontracking/algorithms.py
@@ -104,4 +104,12 @@ def assign_groups(prev_groups, new_groups):
             if ((new_centre[0] - old_centre[0]) ** 2 + (new_centre[1] - old_centre[1]) ** 2) < 50 ** 2:
                 new_group.set_number(group.get_number())
 
-    return new_groups
\ No newline at end of file
+    return new_groups
+
+def updateCarVelocity(oldGroup, newGroup):
+    '''
+    Return a tuple (throttleChange, steeringChange) that should be
+    applied given the change in the centre of the groups. 
+    '''
+    
+    pass
\ No newline at end of file