calc bus time for links not assigned in the hwy net

tm2py/components/network/transit/transit_network.py

@@ -328,13 +328,17 @@ def _get_highway_travel_times(
         _highway_net = _highway_scenario.get_partial_network(
             ["LINK"], include_attributes=False
         )
-        travel_time_attributes = {"LINK": ["#link_id", "auto_time"]}
+        travel_time_attributes = {"LINK": ["#link_id", "auto_time", "@lanes"]}
         self.emme_manager.copy_attribute_values(
             _highway_scenario, _highway_net, travel_time_attributes
         )
         # TODO can we just get the link attributes as a DataFrame and merge them?
+        # if the link does not have meaningful travel time in highway assigned network
+        # such as bus only link, managed lanes, etc.
+        # assume default bus speed of 30 mph
         auto_link_time_dict = {
-            auto_link["#link_id"]: auto_link.auto_time
+            auto_link["#link_id"] : ( auto_link.auto_time
+            if auto_link["@lanes"] > 0 else 60*auto_link["length"]/30 )
             for auto_link in _highway_net.links()
         }
         return auto_link_time_dict