Hello all,
I am aiming to create a simulation that is a variation of the following
tutorial: https://sumo.dlr.de/docs/Tutorials/TraCI4Traffic_Lights.html
I want to recreate something very similar to the simulation described in
the following paper:
https://www.researchgate.net/publication/304290654_A_smart_traffic_solution_for_High_Priority_Vehicles
My aim is to modify this tutorial so that ambulances (priority vehicles)
and cars may come from both east-west directions AND north-south
direction. In this tutorial, cars only come from east-west, and ambulances
only come from north-south.
I have already been able to implement both cars and ambulances arriving
from both directions, but now I am having trouble figuring out how to have
the lights change in a way that accounts for the priority of the
ambulances.
This is the TraCi control loop that is in the tutorial:
def run():
"""execute the TraCI control loop"""
step = 0
# we start with phase 2 where EW has green
traci.trafficlight.setPhase("0", 2)
while traci.simulation.getMinExpectedNumber() > 0:
traci.simulationStep()
if traci.trafficlight.getPhase("0") == 2:
# we are not already switching
if traci.inductionloop.getLastStepVehicleNumber("0") > 0:
# there is a vehicle from the north, switch
traci.trafficlight.setPhase("0", 3)
else:
# otherwise try to keep green for EW
traci.trafficlight.setPhase("0", 2)
step += 1
traci.close()
sys.stdout.flush()
What I want to have happen is for the traffic lights to treat ambulances
with priority, whether they come either from the north south direction, or
the east west direction. I notice that the current ambulance detection is
based on an induction loop, so this would have trouble distinguishing
between cars and ambulances if they are on the same road segment. This
makes me think I need to find a different approach to the traffic light
control loop.
I know that this is possible since it is done in the aforementioned "A
Smart Traffic Solution for High Priority Vehicles" paper. I was wondering
if someone would be able to point me in the right direction of how to
tackle this!
Thank you,
Billy
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