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Changes between Version 2 and Version 3 of HighwayModel

-                      v2
+                      v3
 Decision: We prefer alternative 1.  We don't expect out network to be large enough for performance to be a factor.  Even a list of thousands of LDS could be traversed in a second and we have 30 second intervals between ATMS updates.
+=== Algorithm overview ===
+The algorithm that models congestion will build a simple FIFO queue of highways starting with the highway on which the incident occurs.  Congestion will move linearly opposite the highway direction, advancing one LDS each interval (say 1 second).  At each interval the list of intersections for this highway will be fetched from the Junction Map and checked to see if a junction has been encountered.  If so, the intersecting highway will be added to the queue.  After advancing the congestion for each highway in the queue the algorithm ends.
+Note that highway direction must be handled as indicated by arrows in sketch above.
+Congestion on a !North/South freeway will backup westward on Eastbound lanes of intersection street and eastward on Westbound lanes of intersecting street.
+Conversely for !East/West freeways.