Hello Gerald,
the stretches where guessing did not find an opposite lane are those where
opposites lanes cannot currently be represented due to network topology
(opposite lanes must connect reversed from- and to-nodes). Thus whenever
there are in-between nodes that only apply to one road direction, opposites
do not work.
So if you want to fix this programmatically you need to find edges where
the opposite direction has an in-between node and define a <split>,
then reprocess the networks with these splits and re-guess opposites.

regards,
Jakob

Am Mi., 16. Sept. 2020 um 13:04 Uhr schrieb Richter Gerald <
[email protected]>:

> Hi Jakob,
>
>
> thank you for this swift response - again.
>
>
> using your selection instructions I now can see
>
> that most of the desired associations for opposite lanes have been found
> and implemented
>
> by the netconvert opposite guess reprocessing.
>
>
> however, some stretches - often parallel routes - have been left out and I
> wonder how to elegantly fix this.
>
> (see attachment - selected edges in blue are those where lanes have the
> opposite set)
>
>
>
>    1. can I pick lane ids and enforce a netconvert reprocessing on just
>    those, or
>    2. would the best way be to
>       1. define/select ids for stretches of edges along non-ambiguous
>       routes and
>       2. write a separate script using sumolib which
>       3. would be following these stretches from junction-node to
>       junction node and
>       4. pick out the equivalent closest lane from the opposite direction
>       stretch,
>       5. set lengths to the average and
>       6. associate by setting opposite="..."
>
>
> please share your best guess
> thanks,
> Gerald
>
>
> *Von:* [email protected] <[email protected]> im
> Auftrag von Jakob Erdmann <[email protected]>
> *Gesendet:* Dienstag, 15. September 2020 15:33:31
> *An:* Sumo project User discussions
> *Betreff:* Re: [sumo-user] netedit - lane selection for neigh tag
>
> Hi Gerald,
> the latest nightly version of netedit supports lane attribute 'opposite'
> which you can edit and select for.
> The easiest way to select all lanes with an opposite lane is to enter "_"
> (underscore) in the match-attribute input field.
>
> regards,
> Jakob
>
> Am Mo., 14. Sept. 2020 um 09:47 Uhr schrieb Richter Gerald <
> [email protected]>:
>
>> Hi.
>>
>> Netedit 1.7.0.... recent git
>>
>> to get an overview of the successful guesswork or necessary manual
>> corrections
>> regarding opposite lane overtaking
>>
>> I tried to select for all lanes/edges that have the neigh element within
>> their lane definition
>>
>> using edge selection mode
>> choosing: network elements, lane
>>
>> which does not allow for a selection where neigh is present.
>>
>> is there a way to do this?
>>
>> thanks,
>> Gerald
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