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[sumo-user] Actuated, Time Gap based Traffic Lights (was Re: Customerized defined and modified partners of the SUMO)
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Hi Jane,
see below:
Greetings Harald
Am 14.09.2018 um 16:47 schrieb Jane Cheung:
Harald,
Thanks for
your explanation .
1) May I
have an understanding that all you explain is based on
the circumstance red light (current state) to green
light, not switch from green to red?
First: actuated traffic lights can operate on
Time Gaps or Time Loss (delay based)
For time gaps the situation is as follows:
We have a stop line, where the cars have to stop. We have
detectors in a distance of detector-gap (dg) (seconds) before the
stop line. If the speed limit is 10 m/s (= 36 km/h), the detectors
are 20 m away, if the value of dg is 2.
Now the detector detects the headway between two cars (say C5 and
C6 or C6 and C7). If C7 arrives 4 seconds later at the detector
than C6 (and map-gap is say 3), the traffic light for this flow
goes from green to red (if the green light was at least minDur
seconds active).
In other words: as long as the headway between two cars at the
detector is less or equal 3, the green light will be extended,
until the maxDur value for this phase is reached.
The reason for putting the detectors away from the stop line is to
give the drivers the chance to react on the red light
Stop line Detector
|<-- dg seconds ->|
——————————————————————————————
TLS: | C1 C2 C3 C4 C5 C6 C7 <——( flow direction)
——————————————————————————————_
> actuated:
if (timeHeadWayInApproach
> criticalHeadway) ... switch
For delay based someone else should explain it.
> delay_based: if (delayInApproach
< threshold) ... switch
2) For
example, there are four cars waiting at one intersection.
————————————————————————
TLS: C1 C2 C3 C4 <——( flow direction)
———————————————————————
Just the " the time distance between two adjacent cars C1
and C2" is taken into the consideration? What does time,
distance mean?
Thanks in advance!
Appreciate!
Hi Jane,
the first question was already answered in this group in
June
Am 22.06.2018 um 00:44 schrieb Jane Cheung:
> As a reply, the "Switch'means that the traffic
lights will change the phase?
> What do the "timeHeadWayInApproach" and
"delayInApproach " mean"? How to get the two parameters?
>
> Regards!
> Jane
>
> On Thu, Jun 21, 2018 at 1:06 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx>
wrote:
>
> Both controllers have a trivial formula that
only consists of one inequality each:
>
> actuated: if (timeHeadWayInApproach >
criticalHeadway) ... switch
> delay_based: if (delayInApproach <
threshold) ... switch
>
timeHeadWayInApproach is measured by SUMO using
(automatically inserted) E2 detectors, it means the time
distance between two adjacent cars c1 and c2.
So the switch is triggered as soon as the gap (or headway)
between two cars is greater than a value edited for the
TLS.
Similar for delay in approach. If a car in the traffic
flow is less delayed by the traffic situation, the switch
occurs. Again: this value is computed by SUMO.
To your second question: Here you must compute in a traCi
script, when the switch of phases should occur (see the
example http://sumo.dlr.de/wiki/Tutorials/TraCIPedCrossing
Regards, Harald
Am 13.09.2018 um 18:20 schrieb Jane Cheung:
Dear all ,
There is some problem that I hope someone could help
me.
1) For SUMO, how does the actuated function
of TSL define? In other words, could we express the
function by using some mathematical formulation?
2) If I want to change the default actuated function
in SUMO, how to do it?
Best!
Dear all ,
There is some problem that I hope someone could
help me.
1) For SUMO, how does the actuated function of
TSL define? In other words, could we express the
function by using some mathematical formulation?
2) If I want to change the default actuated
function in SUMO, how to do it?
Best!
Jane
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