Fixing Reverse Connections (RevCons)

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Fixing Reverse Connections (RevCons)

Postby tonytx05 » Sat Jun 13, 2015 12:13 pm

I'd like to recommend that the page on reverse connectivity be updated to include a recommendation on how to best fix this revcons. Just a quick explanation of how to select the node, disallow all turns, then allow all turns should fix the problem, but isn't intuitive to new editors.

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Re: Fixing Reverse Connections (RevCons)

Postby petervdveen » Sat Jun 13, 2015 9:58 pm

I think RevCons can be completely removed from wiki.
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Re: Fixing Reverse Connections (RevCons)

Postby PesachZ » Sun Jun 14, 2015 2:16 am

Considering how well ingrained in the editors experience and scripts RevCons are thus far, simply deleting any reference to them will leave a void. Editors will remember hearing about them from before and they will become a legend which editors will still think needs to be fixed, but won't know the best method (since there will no guidance on them). Instead a small article explaining "what they are, that they used to require being fixed, and are no longer an issue because <fill in reason here>", would probably go a lot longer to transfer the knowledge we have to the terms of thousands of editors who still think dealing with RevCons is an important task.

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Re: Fixing Reverse Connections (RevCons)

Postby tonytx05 » Sun Jun 14, 2015 4:19 am

PesachZ wrote:...Instead a small article explaining "what they are, that they used to require being fixed, and are no longer an issue because <fill in reason here>", would probably go a lot longer to transfer the knowledge we have to the terms of thousands of editors who still think dealing with RevCons is an important task.


So as someone relatively new to this, why are these no longer an issue?
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Re: Fixing Reverse Connections (RevCons)

Postby voludu2 » Mon Jun 15, 2015 5:33 am

I think at, in the short term, it is useful to have something about revcons so map editors searching the wiki can learn exactly that they don't need to bother.

Eventually, the topic could be added to a page listing things we don't need to do any more, but which used to be important. A list like this could be useful to returning editors trying to catch up on changed in the last year, for example.

Fix Revcons. Allow u-turns on unconnected ends of segments. Remove all u-turn arrows. It's a growing list of things we do not need to do any linger.

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Re: Fixing Reverse Connections (RevCons)

Postby Fredo-p » Mon Jun 15, 2015 10:09 am

tonytx05 wrote:
So as someone relatively new to this, why are these no longer an issue?


There has been a long standing misconception/debate about RevCons. According to Waze, they do not pose a problem anymore. HOWEVER, there are still some that belive they are still an issue. Unless that confusion has already been solved and we can go ahead and update the page about RevCons are a thing of the past.

RevCons. AKA the immaculate misconception.
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Re: Fixing Reverse Connections (RevCons)

Postby voludu2 » Tue Jun 16, 2015 2:41 am

How about replacing the article with this. It begins with a summary and guidance.

Then ends with more detail. Technical description is mixed with advice in this article.
Both are global -- we have been told that revcon is now a non-issue on all servers.

If this is not correct, please correct it. Once the corrections stop coming in, I will offer to replace the contents with the corrected version. Thank you for your help.

Here is a first draft.

"Reverse connectivity," often abbreviated "revcon" or "RevCon," happens when a hidden turn is allowed going the wrong direction into a one-way street (against traffic), or leading the wrong direction out of a one-way street. Recent changes to the Waze routing engine mean that revcons are not important. Editors should not fix them.

A connection (turn allowed) from one [[Glossary#segment|segment]] to another via a [[Glossary#junction|junction]] which goes against the directionality of at least one of the segments is called a Reverse Connection, and these segments have "reverse connectivity." Though it is hard to see this in the editor, two segments of a one-way road connected together could have an allowed "turn" in the opposite direction of the flow of traffic, or directionality, of the segments. This can be seen in the editor by turning both segments to 2-way and then seeing the location of the allowed turns.

Earlier versions of the Waze routing engine treated revcons as possible routes where none was allowed. Scripts, such as [[Community Plugins, Extensions and Tools#Highlights for Landmarks and_Segments|Color Highlighting]], WME Toolbox, and WME Validator featured tools to highlight and to fix revcons. These tools are no longer necessary.
Last edited by voludu2 on Sun Jun 21, 2015 12:41 am, edited 1 time in total.

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Re: Fixing Reverse Connections (RevCons)

Postby Fredo-p » Tue Jun 16, 2015 3:30 am

Here's a question. If RevCons are not a thing anymore, but Toolbox shows and offers to fix it, what exactly is Toolbox "fixing"?

Also, I like the writeup so far.
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Re: Fixing Reverse Connections (RevCons)

Postby PesachZ » Tue Jun 16, 2015 8:34 am

Fredo-p wrote:Here's a question. If RevCons are not a thing anymore, but Toolbox shows and offers to fix it, what exactly is Toolbox "fixing"?

Also, I like the writeup so far.

RevCons are still "a thing" in the sense that they continue to exist. They are no longer a concern since the routing server is able to compensate for them, and staff has said "not to worry about them, they won't affect routing".

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Re: Fixing Reverse Connections (RevCons)

Postby deeploz » Tue Jun 16, 2015 9:01 am

Fredo-p wrote:Here's a question. If RevCons are not a thing anymore, but Toolbox shows and offers to fix it, what exactly is Toolbox "fixing"?


It is fixing the allowed turn that is precisely in opposite direction with the traffic flow or the directionality of the adjacent segment, i.e. restricting this turn because is does not make sense.

This fixing seems to be now superficial because these revcons seem to not being any longer considered by the routing algorithm. So fixed or not, it does not impair the route.
As it does not make sense to "fix" something that is not impairing the functioning, the new guideline is that Editors should not fix them anymore.
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