Intended use of get_lane_tailway/headway

[kjang96]

Can we discuss what the intended return of get_lane_tailway and get_lane_headway is? My understanding is that this returns the lane_tailway/lane_headway within the edge of the object veh_id.For the tailway case (and consider the converse for the headway case), we'll naturally want to extend this to include the edges preceding the edge of the object veh_id (correct me if this implementation already exists). If there are multiple edges directly proceeding the object veh_id's current edge, do we want to sort the lane_tailway by route/edge, or simply return the tailways of vehicles closest in distance?