Notes

import os, subprocess, sys, random
sys.path.append(os.path.join(os.path.dirname(__file__),'..', '..', '..','..', 'tools'))
sys.path.append(os.path.join(os.environ.get("SUMO_HOME",os.path.join(os.path.dirname(__file__),'..','..','..')), 'tools'))
from sumolib import checkBinary
import traci

PORT = 8813

nsg = "GrGr"
nsy = "yryr"
weg = "rGrG"
wey = "ryry"

PROGRAM = [wey,wey,wey,nsg,nsg,nsg,nsg,nsg,nsg,nsg,nsg,nsy,nsy,weg]

if not traci.isEmbedded():
N = 9000


pWE = 1./10
pEW = 1./11
pNS = 1./30

routes = open(".rou.xml", "w")
prior_v=open("prior_log.txt","w")
print >> routes, """<routes>
<vtype id="typeWE" accel="0.8" decel="4.5" sigma="0.5" length="7.5" maxspeed="16.67 minGap="2.5" guiShape="passenger/>
<vtype id="typeNS" accel="0.8" decel="4.5" sigma="0.5" length="20" maxspeed="25" guiShape="bus" minGap="3"/>

<route id="right" edges="51o 1i 2o 52i" />
<route id="left" edges="52o 2i 1o 51i" />
<route id="down" edges="54o 4i 3o 53i" />

lastVeh = 0
vehNr = 0
for i in range(N):
if random.uniform(0,1) < pWE:
print >> routes, ' <vehicle id="%i" type="typeWE" route="right" depart="%i" />' % (vehNr, i)
vehNr += 1
lastVeh = i
if random.uniform(0,1) < pEW:
print >> routes, ' <vehicle id="%i" type="typeWE" route="left" depart="%i" />' % (vehNr, i)
vehNr += 1
lastVeh = i
if random.uniform(0,1) < pNS:
print >> routes, ' <vehicle id="%i" type="typeNS" route="down" depart="%i" color="1,0,0"/>' % (vehNr, i)
vehNr += 1
lastVeh = i

print >> routes, "</routes>"
routes.close()

sumoExe = 'sumo-gui'
sumoConfig="sumoconfig.sumocfg"
if len(sys.argv) >1:
retCode = subprocess.call("%s c %s --python-script %s" % (sumoBinary,sumoConfig,__file__),shell=True,stdout=sys.stdout)
sys.exit(retCode)
else:
sumoProcess = subprocess.call("%s -c %s" % (sumoBinary,sumoConfig),shell=True,stdout=sys.stdout )
traci.init(PORT)


programPointer = len(PROGRAM)-1

step = 0
while step == 0 or traci.simulation.getMinExpectedNumber() > 0:
traci.simulationStep()
programPointer = min(programPointer+1, len(PROGRAM)-1)
no = traci.inductionloop.getLastStepVehicleNumber("0")

if no > 0:
programPointer = (0 if programPointer == len(PROGRAM)-1 else 3)
print >> prior_v,"Priority Vehicle Enter at ",traci.simulation.getCurrentTime()," Vehicle-Number :",traci.edge.getLastStepVehicleNumber("4i"),"n"
traci.trafficlights.setRedYellowGreenState("0",PROGRAM[programPointer])
step += 1
traci.close()
sys.stdout.flush()