Re: [sumo-user] Question of traffic signal

[Jakob E. <nam...@go...>]

Hi Brett,
first to get the terms correctly:
a "phase" is a part of the traffic light cycle where for a certain
duration all links have a defined state.
a "link" is connection across the junction defined by a target lane
and a destination lane.
a "state" is one of green (G), green minor (g), yellow (Y), yellow
minr (y), red (r)

Now here is where it gets complicated:
The links across a junction have an index according to their clockwise
ordering around the junction. In the net.xml this index is definined
indirectly via the order of the connection elements. In the gui these
links indices are shown when selecting
View Settings -> Nodes -> Show link junction index

Every link which is controlled by a traffic light also has a tls
linkIndex which is an attribute of the connection element. In the gui
these link indices are shown when selecting
View Settings -> Nodes -> Show link tls index
These link tls indices correspond to order of the states within the
phase definition (the "GGGrrGG" strings). For the traffic light to
work, the length of the string must match the number of links.

Usually the link junction indices and the link tls indices are
identical for each link.
However when working with joined traffic lights (a cluster of
junctions controlled by a single TLS) things are different. Since the
TLS controlls links of multiple junctions,  the link tls index must
provide a mapping between the link junction indices which are no
longer unique and the link tls indices which must be unique.

In principle it is possible to define TLS which only control some of
the links of a junction. Again this done by using link tls indices
which differ from link junction indices.

Another thing that can be accomplished this way is to have "signal
groups" where different links share the same link tls index.

hope this helps.

regards,
Jakob


2013/2/8 Brett Wiesner <br...@ma...>:
> Hi Michael,
>
> Am I correct in assuming that there must be a phase for for each link to be
> a valid TLS program? And is there a numbering convention for links in a
> junction?
>
>
> Thanks,
> Brett
> --
>
> *Brett Wiesner*
> VT MÄK, Director of New Product Innovation
> 150 Cambridge Park Drive, 3rd Floor, Cambridge, MA, 02140
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>
>
> On Fri, Aug 3, 2012 at 12:59 AM, Michael Behrisch <
> beh...@us...> wrote:
>
>> Hi Wei Li,
>>
>> 2012/7/31 Wei Li <agn...@12...>:
>> > Dear Sir/Madam,
>> > I'm new user of sumo. I'm working with a signal  intersection. but i
>> cannot understand the description in tllogic
>> > files, what it means about 'phase' and 'state', what is the difference
>> of them. and what is about 'state' and 'program'.
>>
>> Just a short explanation: A phase is a period of time where the lights
>> do not change for all traffic lights in question, the respective state
>> describes the light shown (basically r for red, y for yellow, g for
>> green) for all links. A link is a lane to lane connection which are
>> numbered consecutively for each junction. The number can be shown via
>> the GUI or read from the net file. A program is just a sequence of
>> phases.
>>
>> There is also a python tool which can be used if one wants to define
>> rather explicit from and to lanes instead of link numbers, all
>> descriptions are here
>>
>> http://sourceforge.net/apps/mediawiki/sumo/index.php?title=Simulation/Traffic_Lights
>>
>> > then when i have tllogic files, how can i implement them to networks and
>> simulation?
>>
>> Just load them as an additional file (option -a)
>>
>> > i don't understand the command-line explaination. and what should be the
>> name of tls-file?
>>
>> The name is arbitrary but by convention it should end with .add.xml
>>
>> Regards,
>> Michael
>>
>>
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