Are Service Roads Functionally Identical to Streets

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Re: Are Service Roads Functionally Identical to Streets

Postby AlanOfTheBerg » Thu Dec 26, 2013 1:51 am

I think they are so close, that we consider them identical. bgodette's rig set up a long while ago did show that service road > street, but I think the default values and routing prefs are nearly identical.
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Re: Are Service Roads Functionally Identical to Streets

Postby AlanOfTheBerg » Mon Jan 20, 2014 9:11 pm

sketch wrote:
AlanOfTheBerg wrote:I think they are so close, that we consider them identical. bgodette's rig set up a long while ago did show that service road > street, but I think the default values and routing prefs are nearly identical.

I think it may be further than we assume. This is conjecture, but knowing what we know about the role type plays in the routing equation, it seems that there is a place for a type that looks like a street, but functions like a ramp. I wonder if the Service Road type already serves this purpose, and if we should maybe use them for collector-distributor roads.

It is conjecture, but I would swear I heard Waze tell us at the 2013 US meetup that Service Road and Street are nearly functionally identical, which is why we moved to have them re-typed by a database update and the Service Road type removed.
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Are Service Roads Functionally Identical to Streets

Postby CBenson » Tue Dec 24, 2013 11:13 am

I am under the impression that we have been told that service roads function identically to streets for routing purposes. However, tckma identified a UR in Maryland complaining about a route that I cannot explain except by concluding that service roads are preferred over streets is at least this particular situation. In this case waze is routing right/U instead of left for some longer routes. The cross-segment is typed street and waze doesn't seem to route right/U for short routes, so this seems to be a street type problem. The odd thing is that waze passes over three other street cross-segments and makes the U at a service road cross-segment. Thus waze routes right for almost a mile and a half before making the U to come back to the intersection rather than making the left. This seems to me to be pure street segment avoidance. But the service segment is used.

Does anyone have an explanation for this routing that is consistent with the idea that service roads are functionally equivalent to street segments?

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Re: Are Service Roads Functionally Identical to Streets

Postby rivercitysyn » Thu Apr 03, 2014 6:31 pm

Any update? Wondering how to treat these areas:
https://www.waze.com/editor/?zoom=7&lat ... layers=901
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Re: Are Service Roads Functionally Identical to Streets

Postby rivercitysyn » Thu Apr 03, 2014 8:03 pm

I split the difference in order to make some specific addresses routeable in response to a UR. So one block is now street since Waze was choosing go past and u turn vs one left. (weird)
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Re: Are Service Roads Functionally Identical to Streets

Postby rivercitysyn » Thu Apr 03, 2014 11:38 pm

Yea I figure it's one road and only a few streets so I agree- and did. I left a note in the UR that this has been done and for the user to please continue to report weird behavior, especially with this section of road.

Fingers crossed.
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Re: Are Service Roads Functionally Identical to Streets

Postby sketch » Wed Jan 15, 2014 10:04 pm

AlanOfTheBerg wrote:I think they are so close, that we consider them identical. bgodette's rig set up a long while ago did show that service road > street, but I think the default values and routing prefs are nearly identical.

I think it may be further than we assume. This is conjecture, but knowing what we know about the role type plays in the routing equation, it seems that there is a place for a type that looks like a street, but functions like a ramp. I wonder if the Service Road type already serves this purpose, and if we should maybe use them for collector-distributor roads.


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Re: Are Service Roads Functionally Identical to Streets

Postby sketch » Mon Jan 20, 2014 9:47 pm

I'm awaiting a response from staff about it. There are more than a few cases where such a type may be necessary. It hasn't disappeared yet, so I don't know, maybe it's there for a reason. But I need answers.


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Re: Are Service Roads Functionally Identical to Streets

Postby sketch » Thu Apr 03, 2014 6:54 pm

I would normally set those to Street type, I suppose, since they don't appear to be used for movements between that highway and other highways. But I wouldn't change anything just yet — many of those parking lot road segments were last edited by relatively high-rank users, so they may have a good reason for that. Although I'm not sure it's necessary any longer with detour prevention.

Service road type is deprecated and should not be used.
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Re: Are Service Roads Functionally Identical to Streets

Postby sketch » Thu Apr 03, 2014 10:16 pm

Honestly, you might as well just change them all to streets. Now that I'm thinking about it again, it seems that those roads were changed to PLot roads before detour prevention is in place; detour prevention will now take care of any potential unwanted routes onto and back off of the service road.
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