Re: [sumo-user] Units of lcStrategic, lcLookaheadLeft, lcAssertive, lcSpeedGain

[Soumya Sharma via sumo-user]

Sorry for the multiple emails.

If all these parameters are factors:
1. How can I calculate the look-ahead distance of a vehicle type?
2. how can I calculate the updated lookahead distance, when I change
parameters like lcStrategic, lcLookaheadLeft, lcAssertive, and lcSpeedGain?
3. Is there a parameter that I can output to get the look-ahead distance of
vehicles in simulation, so I can track what changes occur as a result of
changing values of parameters mentioned in 2?

Thank you.

On Mon, Jun 5, 2023 at 2:36 PM Soumya Sharma  wrote:

> Thank you.
> Could you provide a little context of what this code, specifically those
> lines are doing?
>
> If I change lcStrategic from 1000 to 500, or 1500- what are some effects
> that I can expect?
> I have attached a set of files that I am using for your reference, I only
> change lcStrategic values in it and compare the results.
>
>
> On Mon, Jun 5, 2023 at 10:54 AM Jakob Erdmann 
> wrote:
>
>> see
>> https://github.com/eclipse/sumo/blob/de92290f118f38780aaf9b809a415ef981779b50/src/microsim/MSVehicle.cpp#L5787-L5848
>>
>> Am Mo., 5. Juni 2023 um 16:24 Uhr schrieb Soumya Sharma via sumo-user <
>> sumo-user@eclipse.org>:
>>
>>> Hi Jakob,
>>> Thanks for the information, that is very helpful.
>>>
>>> Also, in one of your previous emails, you mentioned:
>>> "The default look-ahead distance for strategic decision has a maximum
>>> range of about 3000m. You can reduce this distance by setting vType
>>> attribute 'lcStrategic' to a value in [0, 1[. "
>>>
>>> Where does this 3000m distance come from? is it the same as laDist? and
>>> where can I find these default values and the code corresponding to
>>> defaults?
>>> My goal is to understand how the look-ahead distance of a vehicle
>>> changes with changing parameters like "lcStrategic" and "lcLookaheadLeft",
>>> "lcAssertive" and "lcSpeedGain".
>>>
>>> Thanks!
>>>
>>> On Mon, Jun 5, 2023 at 7:57 AM Jakob Erdmann 
>>> wrote:
>>>
>>>> - All these attributes are factors and thus unitless
>>>> - in the laDist computation, the value of LOOK_FORWARD is the time
>>>> (10s) which is then scaled
>>>>
>>>>
>>>> Am So., 4. Juni 2023 um 04:24 Uhr schrieb Soumya Sharma via sumo-user <
>>>> sumo-user@eclipse.org>:
>>>>
>>>>> Hello,
>>>>> I am trying to conduct a sensitivity analysis of car-following and
>>>>> lane-changing parameters in SUMO for hypothetical freeway segments (basic
>>>>> and weaving). I tried changing headway values (car-following) and
>>>>> lcStrategic values (lane-changing) for a basic segment. I used lcStrategic
>>>>> values of 500, 1000, and 1500 for trucks in simulations (length = 15.25m).
>>>>> My trucks are using the CACC model.
>>>>> The two metrics I am interested in are the travel rates (secs/ mi) by
>>>>> vehicle type and the number of lane changes per vehicle type. I found that
>>>>> there was no change in travel rate and a number of lane changes when I
>>>>> changed the value of lcStrategic to 500, 1000, and 1500. I don't 
>>>>> understand
>>>>> why there was no effect of changing the parameter values.
>>>>> Next, I want to look into other parameters like "lcLookaheadLeft",
>>>>> "lcAssertive" and "lcSpeedGain".
>>>>>
>>>>> *Question*: I would like to understand the units of the parameters
>>>>> "lcStrategic" and "lcLookaheadLeft", "lcAssertive" and "lcSpeedGain".
>>>>>
>>>>> The SUMO documentation says:
>>>>>
>>>>>1. lcStrategic: The eagerness for performing strategic lane
>>>>>changing. Higher values result in earlier lane-changing. default: 1.0,
>>>>>range [0-inf), -1 A value of 0 sets the lookahead-distance to 0
>>>>>(vehicles can still change at the end of their lane) whereas -1 
>>>>> disables
>>>>>strategic changing completely.
>>>>>2. lcLookaheadLeft: Factor for configuring the strategic lookahead
>>>>>distance when a change to the left is necessary (relative to right
>>>>>lookahead). default: 2.0, range [0-inf)
>>>>>3. lcAssertive: Willingness to accept lower front and rear gaps on
>>>>>the target lane. The 

Re: [sumo-user] Units of lcStrategic, lcLookaheadLeft, lcAssertive, lcSpeedGain

[Soumya Sharma via sumo-user]

Thank you.
Could you provide a little context of what this code, specifically those
lines are doing?

If I change lcStrategic from 1000 to 500, or 1500- what are some effects
that I can expect?
I have attached a set of files that I am using for your reference, I only
change lcStrategic values in it and compare the results.


On Mon, Jun 5, 2023 at 10:54 AM Jakob Erdmann  wrote:

> see
> https://github.com/eclipse/sumo/blob/de92290f118f38780aaf9b809a415ef981779b50/src/microsim/MSVehicle.cpp#L5787-L5848
>
> Am Mo., 5. Juni 2023 um 16:24 Uhr schrieb Soumya Sharma via sumo-user <
> sumo-user@eclipse.org>:
>
>> Hi Jakob,
>> Thanks for the information, that is very helpful.
>>
>> Also, in one of your previous emails, you mentioned:
>> "The default look-ahead distance for strategic decision has a maximum
>> range of about 3000m. You can reduce this distance by setting vType
>> attribute 'lcStrategic' to a value in [0, 1[. "
>>
>> Where does this 3000m distance come from? is it the same as laDist? and
>> where can I find these default values and the code corresponding to
>> defaults?
>> My goal is to understand how the look-ahead distance of a vehicle
>> changes with changing parameters like "lcStrategic" and "lcLookaheadLeft",
>> "lcAssertive" and "lcSpeedGain".
>>
>> Thanks!
>>
>> On Mon, Jun 5, 2023 at 7:57 AM Jakob Erdmann 
>> wrote:
>>
>>> - All these attributes are factors and thus unitless
>>> - in the laDist computation, the value of LOOK_FORWARD is the time (10s)
>>> which is then scaled
>>>
>>>
>>> Am So., 4. Juni 2023 um 04:24 Uhr schrieb Soumya Sharma via sumo-user <
>>> sumo-user@eclipse.org>:
>>>
>>>> Hello,
>>>> I am trying to conduct a sensitivity analysis of car-following and
>>>> lane-changing parameters in SUMO for hypothetical freeway segments (basic
>>>> and weaving). I tried changing headway values (car-following) and
>>>> lcStrategic values (lane-changing) for a basic segment. I used lcStrategic
>>>> values of 500, 1000, and 1500 for trucks in simulations (length = 15.25m).
>>>> My trucks are using the CACC model.
>>>> The two metrics I am interested in are the travel rates (secs/ mi) by
>>>> vehicle type and the number of lane changes per vehicle type. I found that
>>>> there was no change in travel rate and a number of lane changes when I
>>>> changed the value of lcStrategic to 500, 1000, and 1500. I don't understand
>>>> why there was no effect of changing the parameter values.
>>>> Next, I want to look into other parameters like "lcLookaheadLeft",
>>>> "lcAssertive" and "lcSpeedGain".
>>>>
>>>> *Question*: I would like to understand the units of the parameters
>>>> "lcStrategic" and "lcLookaheadLeft", "lcAssertive" and "lcSpeedGain".
>>>>
>>>> The SUMO documentation says:
>>>>
>>>>1. lcStrategic: The eagerness for performing strategic lane
>>>>changing. Higher values result in earlier lane-changing. default: 1.0,
>>>>range [0-inf), -1 A value of 0 sets the lookahead-distance to 0
>>>>(vehicles can still change at the end of their lane) whereas -1 disables
>>>>strategic changing completely.
>>>>2. lcLookaheadLeft: Factor for configuring the strategic lookahead
>>>>distance when a change to the left is necessary (relative to right
>>>>lookahead). default: 2.0, range [0-inf)
>>>>3. lcAssertive: Willingness to accept lower front and rear gaps on
>>>>the target lane. The required gap is divided by this value. default: 1,
>>>>range: positive reals
>>>>4. lcSpeedGain: The eagerness for performing lane changing to gain
>>>>speed. Higher values result in more lane-changing. default: 1.0, range
>>>>[0-inf)
>>>>
>>>> These definitions don't mention any units explicitly, are they all
>>>> factors? i.e. unitless or are some of them in meters and some unitless?
>>>>
>>>> I was checking the code
>>>> <https://github.com/eclipse/sumo/blob/main/src/microsim/lcmodels/MSLCM_LC2013.cpp#L1850>for
>>>> LC2013 and found that look ahead distance (laDist) is being
>>>> calculated as follows:
>>>>
>>>> laDist = myLookAheadSpeed * LOOK_FORWARD * myStrategicParam * (right ?
>>>> 1 

Re: [sumo-user] Units of lcStrategic, lcLookaheadLeft, lcAssertive, lcSpeedGain

[Soumya Sharma via sumo-user]

Hi Jakob,
Thanks for the information, that is very helpful.

Also, in one of your previous emails, you mentioned:
"The default look-ahead distance for strategic decision has a maximum range
of about 3000m. You can reduce this distance by setting vType attribute '
lcStrategic' to a value in [0, 1[. "

Where does this 3000m distance come from? is it the same as laDist? and
where can I find these default values and the code corresponding to
defaults?
My goal is to understand how the look-ahead distance of a vehicle
changes with changing parameters like "lcStrategic" and "lcLookaheadLeft",
"lcAssertive" and "lcSpeedGain".

Thanks!

On Mon, Jun 5, 2023 at 7:57 AM Jakob Erdmann  wrote:

> - All these attributes are factors and thus unitless
> - in the laDist computation, the value of LOOK_FORWARD is the time (10s)
> which is then scaled
>
>
> Am So., 4. Juni 2023 um 04:24 Uhr schrieb Soumya Sharma via sumo-user <
> sumo-user@eclipse.org>:
>
>> Hello,
>> I am trying to conduct a sensitivity analysis of car-following and
>> lane-changing parameters in SUMO for hypothetical freeway segments (basic
>> and weaving). I tried changing headway values (car-following) and
>> lcStrategic values (lane-changing) for a basic segment. I used lcStrategic
>> values of 500, 1000, and 1500 for trucks in simulations (length = 15.25m).
>> My trucks are using the CACC model.
>> The two metrics I am interested in are the travel rates (secs/ mi) by
>> vehicle type and the number of lane changes per vehicle type. I found that
>> there was no change in travel rate and a number of lane changes when I
>> changed the value of lcStrategic to 500, 1000, and 1500. I don't understand
>> why there was no effect of changing the parameter values.
>> Next, I want to look into other parameters like "lcLookaheadLeft",
>> "lcAssertive" and "lcSpeedGain".
>>
>> *Question*: I would like to understand the units of the parameters
>> "lcStrategic" and "lcLookaheadLeft", "lcAssertive" and "lcSpeedGain".
>>
>> The SUMO documentation says:
>>
>>1. lcStrategic: The eagerness for performing strategic lane changing.
>>Higher values result in earlier lane-changing. default: 1.0, range 
>> [0-inf),
>>-1 A value of 0 sets the lookahead-distance to 0 (vehicles can still
>>change at the end of their lane) whereas -1 disables strategic changing
>>completely.
>>2. lcLookaheadLeft: Factor for configuring the strategic lookahead
>>distance when a change to the left is necessary (relative to right
>>lookahead). default: 2.0, range [0-inf)
>>3. lcAssertive: Willingness to accept lower front and rear gaps on
>>the target lane. The required gap is divided by this value. default: 1,
>>range: positive reals
>>4. lcSpeedGain: The eagerness for performing lane changing to gain
>>speed. Higher values result in more lane-changing. default: 1.0, range
>>[0-inf)
>>
>> These definitions don't mention any units explicitly, are they all
>> factors? i.e. unitless or are some of them in meters and some unitless?
>>
>> I was checking the code
>> <https://github.com/eclipse/sumo/blob/main/src/microsim/lcmodels/MSLCM_LC2013.cpp#L1850>for
>> LC2013 and found that look ahead distance (laDist) is being
>> calculated as follows:
>>
>> laDist = myLookAheadSpeed * LOOK_FORWARD * myStrategicParam * (right ? 1
>> : myLookaheadLeft);
>>
>>
>> If this is how the look-ahead distance for a vehicle is calculated when
>> making lane-changing decisions, then both lcLookaheadLeft and
>> lcStrategic specified will be used to calculate laDist but I don't know
>> what what the units of any of these parameters are. For laDist to be in
>> distance units, speed would be multiplied by time here.
>>
>> Please share any information that is available as it would help me
>> understand my results better.
>>
>> Thanks,
>> Soumya.
>> ___
>> sumo-user mailing list
>> sumo-user@eclipse.org
>> To unsubscribe from this list, visit
>> https://www.eclipse.org/mailman/listinfo/sumo-user
>>
> ___
> sumo-user mailing list
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>


-- 
Thank you,
Soumya Sharma
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[sumo-user] Units of lcStrategic, lcLookaheadLeft, lcAssertive, lcSpeedGain

[Soumya Sharma via sumo-user]

Hello,
I am trying to conduct a sensitivity analysis of car-following and
lane-changing parameters in SUMO for hypothetical freeway segments (basic
and weaving). I tried changing headway values (car-following) and
lcStrategic values (lane-changing) for a basic segment. I used lcStrategic
values of 500, 1000, and 1500 for trucks in simulations (length = 15.25m).
My trucks are using the CACC model.
The two metrics I am interested in are the travel rates (secs/ mi) by
vehicle type and the number of lane changes per vehicle type. I found that
there was no change in travel rate and a number of lane changes when I
changed the value of lcStrategic to 500, 1000, and 1500. I don't understand
why there was no effect of changing the parameter values.
Next, I want to look into other parameters like "lcLookaheadLeft",
"lcAssertive" and "lcSpeedGain".

*Question*: I would like to understand the units of the parameters
"lcStrategic" and "lcLookaheadLeft", "lcAssertive" and "lcSpeedGain".

The SUMO documentation says:

   1. lcStrategic: The eagerness for performing strategic lane changing.
   Higher values result in earlier lane-changing. default: 1.0, range [0-inf),
   -1 A value of 0 sets the lookahead-distance to 0 (vehicles can still
   change at the end of their lane) whereas -1 disables strategic changing
   completely.
   2. lcLookaheadLeft: Factor for configuring the strategic lookahead
   distance when a change to the left is necessary (relative to right
   lookahead). default: 2.0, range [0-inf)
   3. lcAssertive: Willingness to accept lower front and rear gaps on the
   target lane. The required gap is divided by this value. default: 1, range:
   positive reals
   4. lcSpeedGain: The eagerness for performing lane changing to gain
   speed. Higher values result in more lane-changing. default: 1.0, range
   [0-inf)

These definitions don't mention any units explicitly, are they all factors?
i.e. unitless or are some of them in meters and some unitless?

I was checking the code
for
LC2013 and found that look ahead distance (laDist) is being calculated as
follows:

laDist = myLookAheadSpeed * LOOK_FORWARD * myStrategicParam * (right ? 1 :
myLookaheadLeft);


If this is how the look-ahead distance for a vehicle is calculated when
making lane-changing decisions, then both lcLookaheadLeft and lcStrategic
specified will be used to calculate laDist but I don't know what what the
units of any of these parameters are. For laDist to be in distance units,
speed would be multiplied by time here.

Please share any information that is available as it would help me
understand my results better.

Thanks,
Soumya.
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Re: [sumo-user] Issue with xml2csv in cmd

[Soumya Sharma via sumo-user]

Thanks Jakob and Harald!
My issue was resolved when I set up a default program to open the XML and
Python files.
For my use, I need to post-process output files and save them as CSV so
Netedit would probably not work but that is an interesting feature. Could
you share any documentation that guides on how to call xml2csv from within
Netedit?

On Wed, May 10, 2023 at 3:35 AM Jakob Erdmann  wrote:

> Note, that you can call xml2csv from within netedit since version 1.17.0
>
> Am Mi., 10. Mai 2023 um 07:07 Uhr schrieb Harald Schaefer <
> fechs...@gmail.com>:
>
>> Hi Soumya
>>
>> please see
>> https://sumo.dlr.de/docs/Tools/index.html#how_to_use_python_tools in the
>> SUMO documentation
>>
>>
>> Am 09.05.23 um 15:44 schrieb Soumya Sharma via sumo-user:
>>
>> Hi,
>> I am trying to use the xml2csv.py file to convert XML output files to CSV
>> using Command Prompt on my Windows machine. However, the command line just
>> opens the xml2csv file in Notepad instead of converting the file.
>>
>> Here is what I tried to do:
>> 1. Changed my directory:
>> C:\Users\Soumya>cd /D "G:\Shared drives\NCDOT_AV_Project\Task 4-
>> Freight-Related Impact\SUMO Analysis\Basic\10% Trucks\1500
>> vphpl\0TAV_10TT_90TV\Run1"
>>
>> 2. Tried to convert using xml2csv
>> G:\Shared drives\NCDOT_AV_Project\Task 4- Freight-Related Impact\SUMO
>> Analysis\Basic\10% Trucks\1500 vphpl\0TAV_10TT_90TV\Run1>xml2csv.py
>> 0TAV_10TT_90TV.xml 0TAV_10TT_90TV.csv
>>
>> What am I doing wrong? Please help, thanks in advance!
>>
>> Soumya.
>>
>> ___
>> sumo-user mailing listsumo-u...@eclipse.org
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>> https://www.eclipse.org/mailman/listinfo/sumo-user
>>
>> ___
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>>
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-- 
Thank you,
Soumya Sharma
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[sumo-user] Issue with xml2csv in cmd

[Soumya Sharma via sumo-user]

Hi,
I am trying to use the xml2csv.py file to convert XML output files to CSV
using Command Prompt on my Windows machine. However, the command line just
opens the xml2csv file in Notepad instead of converting the file.

Here is what I tried to do:
1. Changed my directory:
C:\Users\Soumya>cd /D "G:\Shared drives\NCDOT_AV_Project\Task 4-
Freight-Related Impact\SUMO Analysis\Basic\10% Trucks\1500
vphpl\0TAV_10TT_90TV\Run1"

2. Tried to convert using xml2csv
G:\Shared drives\NCDOT_AV_Project\Task 4- Freight-Related Impact\SUMO
Analysis\Basic\10% Trucks\1500 vphpl\0TAV_10TT_90TV\Run1>xml2csv.py
0TAV_10TT_90TV.xml 0TAV_10TT_90TV.csv

What am I doing wrong? Please help, thanks in advance!

Soumya.
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