Hi,

I'm trying to use multi-entry/multi-exit detectors with TraCI and I'm getting 
strange results.

I want to use them to count how many vehicles take each turn on a junction.  I 
have defined one E3 detector with the entry one one lane approaching a junction 
and exit on one lane on the other side of the junction. I've also defined a 
second E3 detector with entry in the same lane as the first one and exit on 
another lane:

<additional xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/additional_file.xsd";>
    <e3Detector id="e3Detector_0" pos="2459.46,3350.14" freq="900.00" 
file="e3Detector_0.xml">
        <detEntry lane="32116245#3_0" pos="119.86"/>
        <detExit lane="32116250#0_0" pos="2.33"/>
    </e3Detector>
    <e3Detector id="e3Detector_1" pos="2462.18,3351.07" freq="900.00" 
file="e3Detector_1.xml">
        <detEntry lane="32116245#3_0" pos="118.36"/>
        <detExit lane="32116247#0_0" pos="1.81"/>
    </e3Detector>
</additional>

However, when I use getLastStepVehicleIDs on each of the detectors, I get the 
same result:

libsumo.multientryexit.getLastStepVehicleIDs('e3Detector_0')
('37', '56', '57')

libsumo.multientryexit.getLastStepVehicleIDs('e3Detector_1')
('37', '56', '57')

How can it be the all vehicles have gone through 2 detectors if they have the 
exit point in different lanes (of different edges)? Am I interpreting wrongly 
what getLastStepVehicleIDs "Returns the list of ids of vehicles that have been 
within the named multi-entry/multi-exit detector in the last simulation step" 
means?

Thanks,

               Didac


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Didac Busquets / Co-Founder and Chief Scientist
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