Dear SUMO contributors,
I'm using SUMO with Python to simulate the movement of taxicabs. To collect
relevant statistics, I expect the taxicabs to start and end movement at the
time I wish. But the problem I encountered is: even if I continuously update
the route of the taxicabs before they arrive at the previously scheduled
destination (by checking whether the current edge is on the [-2] index of
the current route), the vehicles will leave the network gradually regardless
of my route update function. I'm sure my route update function (using
traci.vehicle.changeTarget()) works:
hello hello
change route, wait
targetEdge: -1 96337886 1.0 4 None
None
currentEdge: gneE198
hello hello
change route, wait
targetEdge: -1 97234470#2 1.0 4 None
None
currentEdge: 25435153#0
hello hello
change route, wait
targetEdge: -1 243508824#6 1.0 4 None
None
currentEdge: -97234776#2.4
-----------
taxi1 plan:
-1 243508824#6 1.0 4 None
current: 243508824#6 10.1719127836
operatingState: 2
currentStatus: 0
countPassengers: 0
nextUpdate: -1 243508824#6 1.0 4 None
None
route length: 9553 total edges: 8567
-----------
Traceback (most recent call last):
File "drt.py", line 206, in <module>
run(runId)
File "drt.py", line 70, in run
while traci.simulation.getMinExpectedNumber() > 0:
File "Z:\sumo-0.23.0\tools\traci\simulation.py", line 186, in
getMinExpectedNu
mber
return _getUniversal(tc.VAR_MIN_EXPECTED_VEHICLES)
File "Z:\sumo-0.23.0\tools\traci\simulation.py", line 52, in _getUniversal
result = traci._sendReadOneStringCmd(tc.CMD_GET_SIM_VARIABLE, varID, "")
File "Z:\sumo-0.23.0\tools\traci\__init__.py", line 330, in
_sendReadOneString
Cmd
return _checkResult(cmdID, varID, objID)
File "Z:\sumo-0.23.0\tools\traci\__init__.py", line 359, in _checkResult
result = _sendExact()
File "Z:\sumo-0.23.0\tools\traci\__init__.py", line 293, in _sendExact
_connections[""].send(length + _message.string)
KeyError: ''
As you can see from the log, taxi1 changed its route each time when it is
about to reach the last edge on route. But at the last step, it drove into
edge "243508824#6" and left the network. I've searched and known that the
vehicles' leaving can be avoided by repeatedly updating its route. It seems
to me that there are some other parameters controlling the end of vehicle
movement. The road network is a closed loop without dead end or dead start.
I've also specified start time and end time in sumocfg:
<time>
<begin value="0"/>
<end value="36600"/>
</time>
But this doesn't work because I give the vehicles routes dynamically. Could
you please shed some light on this problem? Thank you and happy new year!
Best regards,
Li
Li Yan, Ph.D. candidate
Department of Computer Science
University of Virginia
Personal website: <http://www.people.virginia.edu/~ly4ss/>
http://www.people.virginia.edu/~ly4ss/
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