Aux transit volumes (#384)

* Add `aux_transit_volume` attribute and extra attribute name check

* Add saving and printing of `aux_transit_volume` attribute

* Add volume factor

Author: Jens West

Scripts/assignment/assignment_period.py

@@ -767,7 +767,10 @@ def _assign_congested_transit(self):
                 class_name=tc)
         base_timtr = param.uncongested_transit_time
         time_attr = self.extra(base_timtr)
+        volax_attr = self.extra("aux_transit")
         network = self.emme_scenario.get_network()
+        for link in network.links():
+            link[volax_attr] = link.aux_transit_volume
         for segment in network.transit_segments():
             segment[time_attr] = segment['@'+base_timtr]
         self.emme_scenario.publish_network(network)

Scripts/assignment/emme_assignment.py

@@ -150,7 +150,7 @@ def aggregate_results(self, resultdata):
                 if res != "transit_volumes":
                     self._node_24h(
                         transit_class, param.segment_results[res])
-        ass_classes = list(param.emme_demand_mtx) + ["bus"]
+        ass_classes = list(param.emme_demand_mtx) + ["bus", "aux_transit"]
         for ass_class in ass_classes:
             self._link_24h(ass_class)
 
@@ -343,7 +343,7 @@ def _create_attributes(self, scenario, extra):
             self.emme_project.create_extra_attribute(
                 "LINK", extra(ass_class), ass_class + " volume",
                 overwrite=True, scenario=scenario)
-        for attr in ("total_cost", "toll_cost", "car_time"):
+        for attr in ("total_cost", "toll_cost", "car_time", "aux_transit"):
             self.emme_project.create_extra_attribute(
                 "LINK", extra(attr), attr,
                 overwrite=True, scenario=scenario)

Scripts/assignment/emme_bindings/mock_project.py

@@ -430,6 +430,8 @@ def publish_network(self, network):
 
 class ExtraAttribute:
     def __init__(self, name, attr_type, default_value, scenario):
+        if len(name) > 20 or name[0] != '@':
+            raise ArgumentError("Invalid extra attribute ID: {}".format(name))
         self.name = name
         self.type = attr_type
         self.default_value = default_value
@@ -644,6 +646,7 @@ def __init__(self, network, i_node, j_node, modes):
         self.num_lanes = 1
         self.volume_delay_func = 0
         self.auto_time = 0.1
+        self.aux_transit_volume = 0.0
         self._segments = []
 
     @property
@@ -721,3 +724,7 @@ def j_node(self):
 
 class ExistenceError(Exception):
     pass
+
+
+class ArgumentError(Exception):
+    pass

Scripts/helmet_validate_inputfiles.py

@@ -129,7 +129,7 @@ def main(args):
             nr_vehicle_classes = len(param.emme_demand_mtx) + 1
             nr_new_attr = {
                 "nodes": nr_transit_classes * (nr_segment_results-1),
-                "links": nr_vehicle_classes + 3,
+                "links": nr_vehicle_classes + 4,
                 "transit_lines": 0,
                 "transit_segments": nr_transit_classes*nr_segment_results + 1,
             }

Scripts/parameters/assignment.py

@@ -348,6 +348,7 @@
         "iht": 1 / 0.497,
     },
 }
+volume_factors["aux_transit"] = volume_factors["transit"]
 # Factor for converting weekday traffic into yearly day average
 years_average_day_factor = 0.85
 # Factor for converting day traffic into 7:00-22:00 traffic