Hi there,
I am trying to extract vehicle priority information in two cases: 1) four-way priority-based intersection 2) four-way always stop intersection. I am using the latest version of SUMO and am developing through the Python API.
I have used
sumolib.net to perform a static map analysis of what lanes have priority and which are foes of each other, from which I can extract map-based priority rules at priority-based junctions.
However, for the always stop case, how can I extract which vehicle has priority at a given moment in time if there are multiple vehicles approach the intersection or if there are multiple vehicles stopped at the intersection? I have been using traci.vehicle.getJunctionFoes(veh_id),
traci.vehicle.getNextLinks(veh_id),
traci.lane.getLinks(lane), traci.lane.getFoes(lane_ID, to_laneID) but I have run into some issues.
I believe that
traci.lane.getLinks(lane), traci.lane.getFoes(lane_ID, to_laneID)
are useful for static map analysis but not for the dynamic scene. Is this correct?
I setup a case where a single vehicle approaches
the four-way (always stop) scenario without any other traffic. The vehicle stops but getLinks() is always returning isOpen=False, hasPrio=False, and hasFoe=False. Is this the standard output at an always stop case? Do those boolean flags ever change with time?
I have noticed the same with traci.vehicle.getNextLinks(veh_id).
However, self.k.kernel_api.vehicle.getJunctionFoes(veh_id)
does return an empty list in this toy example. Is it sufficient to consider the foes of each vehicle at an intersection and if any vehicle has an empty list of foes, then it is the vehicle with right of way? I know that impatience parameters can affect which
vehicle crosses whhen as well.
I initially thought that using traci.vehicle.getWaitingTime() or traci.vehicle.getAccumulatedWaitingTime()
would indicate which vehicle at intersection has right-of-way (the one with the highest waiting time). Should this be the case? getWaitingTime() resets to 0 if a vehicle inches near the stop line so I am not sure this would be the most reliable indicator.
Is there a different way to extract which vehicle's turn it is to cross in an always stop scenario? What are the rules being used for this?
Let me know if you have any suggestions on how
to do extract vehicle priorities in dynamic/interaction-based intersections.
Best,
Daniel
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