Fixing Reverse Connections (RevCons)

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Re: Fixing Reverse Connections (RevCons)

Postby voludu2 » Tue Jun 16, 2015 10:19 am

The discussion of what to do about toolbox can happen on the toolbox topic.

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Re: Fixing Reverse Connections (RevCons)

Postby Fredo-p » Tue Jun 16, 2015 2:31 pm

voludu2 wrote:The discussion of what to do about toolbox can happen on the toolbox topic.


I thought it did. That's where I found out about the RevCon confusion.
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Re: Fixing Reverse Connections (RevCons)

Postby voludu2 » Tue Jun 16, 2015 6:01 pm

Good.

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Re: Fixing Reverse Connections (RevCons)

Postby nzahn1 » Wed Jun 17, 2015 8:41 pm

Quick note on fixing RevCons:
It does add some robustness to the map. If a one-way segment has the correct turns in & out (no RevCons), then if the segment is set as two-way, the routing won't be broken.
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Re: Fixing Reverse Connections (RevCons)

Postby sketch » Fri Jun 19, 2015 1:35 am

Regardless of whether revcons have an actual effect on routing, they still sometimes indicate that something may have been edited without the utmost care. It's worth keeping information on what they are and why they exist/how they come to be (and keeping the highlight therefor, though that's a topic for a different discussion).
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Re: Fixing Reverse Connections (RevCons)

Postby PesachZ » Fri Jun 19, 2015 2:08 am

sketch wrote:Regardless of whether revcons have an actual effect on routing, they still sometimes indicate that something may have been edited without the utmost care. It's worth keeping information on what they are and why they exist/how they come to be (and keeping the highlight therefor, though that's a topic for a different discussion).

Are you saying we should still spend the time to fix them, even if they have no effect on routing?

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Re: Fixing Reverse Connections (RevCons)

Postby sketch » Fri Jun 19, 2015 2:33 am

I'm saying that when they're present, the situation is worth investigating, to see if perhaps a segment was erroneously set to one-way or the wrong way. And once we get there and verify the map is correct, we can eliminate them really quickly with JNF anyway, to 'mark' that there is no longer a situation that might need fixing.

IME revcons are as good as or better than MPs at indicating problems on the map.
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Re: Fixing Reverse Connections (RevCons)

Postby voludu2 » Sun Jun 21, 2015 1:03 am

Then how about with this addition:
"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 eliminate reverse connections.

Although reverse connections have no effect on routing, they can highlight problems on the map, such as a segment accidentally set one way the wrong way or one way when it ought to be two way.

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Re: Fixing Reverse Connections (RevCons)

Postby nzahn1 » Sun Jun 21, 2015 2:27 am

voludu2 wrote: Editors should not fix them.

Maybe too strong. What about:
Editors need not fix them.
or
Editors do not have to fix them.
or
Editors are not obligated to fix them.

In some editors' view, fixing Rev Cons may be a waste of time, but fixing them is not detrimental to the map.
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Re: Fixing Reverse Connections (RevCons)

Postby bgodette » Sun Jun 21, 2015 8:49 am

Confirmed with test rig that RevCon is ignored as far as penalties I could apply to cause it to use them, so at this point I believe in the default routing algo (Fastest) that they don't exist. There still may be issues for users using Shortest until that algo is updated.
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