Dear all,
I would like to know if the execution of TraCI with SUMO is deterministic - I
get some weird results reading values from induction loops.
For example, I am counting the number of vehicles waiting in front of the
traffic light. The problem is that if I do not wait a little bit after command
“traci.simulationStep”, the readings get weird.
A simple example based on tutorial code:
waitingVehiclesNumberNorth = 0
waitingVehiclesNumberWest = 0
# we start with phase 2 where EW has green
traci.trafficlights.setPhase("0", 2)
while traci.simulation.getMinExpectedNumber() > 0:
traci.simulationStep()
#time.sleep(0.5) - sometimes, even if I sleep, I get wrong results
waitingVehiclesNumberNorth +=
traci.inductionloop.getLastStepVehicleNumber("0") -
traci.inductionloop.getLastStepVehicleNumber("2")
waitingVehiclesNumberWest +=
traci.inductionloop.getLastStepVehicleNumber("1") -
traci.inductionloop.getLastStepVehicleNumber("3")
print("West: {:3}, North: {:3}".format(waitingVehiclesNumberWest,
waitingVehiclesNumberNorth))
if traci.trafficlights.getPhase("0") == 2:
# we are not already switching
if waitingVehiclesNumberNorth > 3 and waitingVehiclesNumberWest < 20:
# there is a vehicle from the north, switch
traci.trafficlights.setPhase("0", 3)
else:
# otherwise try to keep green for EW
traci.trafficlights.setPhase("0", 2)
The problem above is that the variable “waitingVehiclesNumberNorth” increases
although I see the vehicles passed the second induction loop - this happens
only if I do not use sleep command or if sleep time is short.
Could anyone tell me please if there is some problem in my perception of using
this library? I am using SUMO 0.27.1, compiled on a Mac.
Thanks,
Slavko
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