--- a/trafficintelligence/ubc_utils.py	Wed Feb 20 16:16:19 2019 -0500
+++ b/trafficintelligence/ubc_utils.py	Fri Feb 22 17:22:04 2019 -0500
@@ -1,7 +1,7 @@
 #! /usr/bin/env python
 '''Various utilities to load data saved by the UBC tool(s)'''
 
-from trafficintelligence import utils, events, storage
+from trafficintelligence import utils, events, storage, indicators
 from trafficintelligence.moving import MovingObject, TimeInterval, Trajectory
 
 
@@ -60,10 +60,10 @@
     infile = utils.openCheck(inFilename)
     outfile = utils.openCheck(outFilename,'w')
 
-    if (inFilename.find('features') >= 0) or (not infile) or (not outfile):
+    if (inFilename.find('features') >= 0) or infile is None or outfile is None:
         return
 
-    lines = storage.getLines(infile)
+    lines = utils.getLines(infile)
     objNum = 0 # in inFilename
     while lines != []:
         # find object in objects (index i)
@@ -80,7 +80,7 @@
             outfile.write(utils.delimiterChar+'\n')
         # next object
         objNum += 1
-        lines = storage.getLines(infile)
+        lines = utils.getLines(infile)
 
     print('read {0} objects'.format(objNum))
 
@@ -89,7 +89,7 @@
     fileIn = utils.openCheck(filenameIn, 'r', True)
     fileOut = utils.openCheck(filenameOut, "w", True)
 
-    lines = storage.getLines(fileIn)
+    lines = utils.getLines(fileIn)
     trajNum = 0
     while (lines != []):
         modifiedLines = modifyLines(trajNum, lines)
@@ -97,7 +97,7 @@
             for l in modifiedLines:
                 fileOut.write(l+"\n")
             fileOut.write(utils.delimiterChar+"\n")
-        lines = storage.getLines(fileIn)
+        lines = utils.getLines(fileIn)
         trajNum += 1
          
     fileIn.close()
@@ -109,14 +109,14 @@
     fileIn = utils.openCheck(filenameIn, 'r', True)
     fileOut = utils.openCheck(filenameOut, "w", True)
 
-    lines = storage.getLines(fileIn)
+    lines = utils.getLines(fileIn)
     trajNum = 0
     while (lines != []):
         if keepTrajectory(trajNum, lines):
             for l in lines:
                 fileOut.write(l+"\n")
             fileOut.write(utils.delimiterChar+"\n")
-        lines = storage.getLines(fileIn)
+        lines = utils.getLines(fileIn)
         trajNum += 1
         
     fileIn.close()
@@ -125,14 +125,14 @@
 def loadTrajectories(filename, nObjects = -1):
     '''Loads trajectories'''
 
-    file = utils.openCheck(filename)
-    if (not file):
+    f = utils.openCheck(filename)
+    if f is None:
         return []
 
     objects = []
     objNum = 0
     objectType = getFileType(filename)
-    lines = storage.getLines(file)
+    lines = utils.getLines(f)
     while (lines != []) and ((nObjects<0) or (objNum<nObjects)):
         l = lines[0].split(' ')
         parsedLine = [int(n) for n in l[:4]]
@@ -162,9 +162,9 @@
         else:
             print("Error two lines of data for feature {}".format(f.num))
 
-        lines = storage.getLines(file)
+        lines = utils.getLines(f)
 
-    file.close()
+    f.close()
     return objects
    
 def getFeatureNumbers(objects):
@@ -175,18 +175,16 @@
 
 def loadInteractions(filename, nInteractions = -1):
     'Loads interactions from the old UBC traffic event format'
-    from events import Interaction 
-    from indicators import SeverityIndicator
-    file = utils.openCheck(filename)
-    if (not file):
+    f = utils.openCheck(filename)
+    if f is None:
         return []
 
     interactions = []
     interactionNum = 0
-    lines = storage.getLines(file)
+    lines = utils.getLines(f)
     while (lines != []) and ((nInteractions<0) or (interactionNum<nInteractions)):
         parsedLine = [int(n) for n in lines[0].split(' ')]
-        inter = Interaction(interactionNum, TimeInterval(parsedLine[1],parsedLine[2]), parsedLine[3], parsedLine[4], categoryNum = parsedLine[5])
+        inter = events.Interaction(interactionNum, TimeInterval(parsedLine[1],parsedLine[2]), parsedLine[3], parsedLine[4], categoryNum = parsedLine[5])
         
         indicatorFrameNums = [int(n) for n in lines[1].split(' ')]
         for indicatorNum,line in enumerate(lines[2:]):
@@ -194,25 +192,25 @@
             for i,v in enumerate([float(n) for n in line.split(' ')]):
                 if not ignoredValue[indicatorNum] or v != ignoredValue[indicatorNum]:
                     values[indicatorFrameNums[i]] = v
-            inter.addIndicator(SeverityIndicator(severityIndicatorNames[indicatorNum], values, None, mostSevereIsMax[indicatorNum]))
+            inter.addIndicator(indicators.SeverityIndicator(severityIndicatorNames[indicatorNum], values, None, mostSevereIsMax[indicatorNum]))
 
         interactions.append(inter)
         interactionNum+=1
-        lines = storage.getLines(file)
+        lines = utils.getLines(f)
 
-    file.close()
+    f.close()
     return interactions
 
 def loadCollisionPoints(filename, nPoints = -1):
     '''Loads collision points and returns a dict
     with keys as a pair of the numbers of the two interacting objects'''
-    file = utils.openCheck(filename)
-    if (not file):
+    f = utils.openCheck(filename)
+    if f is None:
         return []
 
     points = {}
     num = 0
-    lines = storage.getLines(file)
+    lines = utils.getLines(f)
     while (lines != []) and ((nPoints<0) or (num<nPoints)):
         parsedLine = [int(n) for n in lines[0].split(' ')]
         protagonistNums = (parsedLine[0], parsedLine[1])
@@ -220,7 +218,7 @@
                                    [float(n) for n in lines[2].split(' ')]]
 
         num+=1
-        lines = storage.getLines(file)
+        lines = utils.getLines(f)
 
-    file.close()
+    f.close()
     return points