--- a/python/events.py	Mon Jun 17 16:26:11 2013 -0400
+++ b/python/events.py	Wed Jun 19 22:56:21 2013 -0400
@@ -35,7 +35,7 @@
 
     def __init__(self, num = None, timeInterval = None, roaduserNum1 = None, roaduserNum2 = None, roadUser1 = None, roadUser2 = None, categoryNum = None):
         moving.STObject.__init__(self, num, timeInterval)
-        self.roaduserNumbers = set([roaduserNum1, roaduserNum2])
+        self.roadUserNumbers = set([roaduserNum1, roaduserNum2])
         self.roadUser1 = roadUser1
         self.roadUser2 = roadUser2
         self.categoryNum = categoryNum
@@ -90,9 +90,8 @@
     def computeCrossingsCollisions(self, predictionParameters, collisionDistanceThreshold, timeHorizon, computeCZ = False, debug = False, timeInterval = None):
         '''Computes all crossing and collision points at each common instant for two road users. '''
         self.collisionPoints={}
+        self.crossingZones={}
         TTCs = {}
-        if computeCZ:
-            self.crossingZones={}
 
         if timeInterval:
             commonTimeInterval = timeInterval