[sumo-user] update traffic signal via TraCi

[Sha, Rui]

Hello,

I am using SUMO 0.25.0 and trying to change the traffic signal plans for every signal cycle.

I have been using traci.trafficlights.setCompleteRedYellowGreenDefinition to define the new timing plans for the next cycle. I update the duration of phases and increase the number of phases of a cycle when needed. However, I have noticed that traffic lights in SUMO simulation do not always perform the way I defined. Sometimes, the status (green,red and yellow) and the duration of phase can be wrong.

I did some tests by myself, and found the right time to use function setCompleteRedYellowGreenDefinition is at the first time step when the new cycle starts instead of the last time step of the current cycle. At the same time, I have to use function setPhaseDuration for the first phase of the new cycle to update the result in function getNextSwitch. But all of what I tried still cannot guarantee SUMO to implement the traffic signal plans I defined.

I hope can have some advices for this situation, and please correct me if what I said is incorrect.

Many thanks,
Rui

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[r***@icloud.com]

Hello,



I am using SUMO 0.25.0 and trying to change the traffic signal plans for
every signal cycle.



I have been using traci.trafficlights.setCompleteRedYellowGreenDefinition to
define the new timing plans for the next cycle. I update the duration of
phases and increase the number of phases of a cycle when needed. However, I
have noticed that traffic lights in SUMO simulation do not always perform
the way I defined. Sometimes, the status (green,red and yellow) and the
duration of phase can be wrong.



I did some tests by myself, and found the right time to use function
setCompleteRedYellowGreenDefinition is at the first time step when the new
cycle starts instead of the last time step of the current cycle. At the same
time, I have to use function setPhaseDuration for the first phase of the new
cycle to update the result in function getNextSwitch. But all of what I
tried still cannot guarantee SUMO to implement the traffic signal plans I
defined.



I hope can have some advices for this situation, and please correct me if
what I said is incorrect.



Many thanks,

Rui





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[Jakob Erdmann]

Hello,
It would help if you could define a *minimal* example of what you try to
accomplish and how various control approaches fail to perform as expected
from the documentation.
Personally I tend to define all possible phases in advance and then control
the cycle via the traci.trafficlights.setPhase.
It helps to set a high duration (1000s) for some of the pre-defined phases
to avoid premature switching.
For phases that always follow each other without variation, I use SUMOs
native switching.

regards,
Jakob

Post by Sha, Rui
Hello,
I am using SUMO 0.25.0 and trying to change the traffic signal plans for
every signal cycle.
I have been using traci.trafficlights.setCompleteRedYellowGreenDefinition to
define the new timing plans for the next cycle. I update the duration of
phases and increase the number of phases of a cycle when needed. However, I
have noticed that traffic lights in SUMO simulation do not always perform
the way I defined. Sometimes, the status (green,red and yellow) and the
duration of phase can be wrong.
I did some tests by myself, and found the right time to use function
setCompleteRedYellowGreenDefinition is at the first time step when the new
cycle starts instead of the last time step of the current cycle. At the same
time, I have to use function setPhaseDuration for the first phase of the new
cycle to update the result in function getNextSwitch. But all of what I
tried still cannot guarantee SUMO to implement the traffic signal plans I
defined.
I hope can have some advices for this situation, and please correct me if
what I said is incorrect.
Many thanks,
Rui
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