Using service roads to connect highways

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Re: Using service roads to connect highways

Postby Scruffy151 » Sun Jan 06, 2013 9:30 am

What a mess. In my opinion most of those should be ramps, some major highways and some service roads.

The simple way to think of service roads is to equate them to frontage roads. They are for accessing businesses with addresses on the highway.
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Re: Using service roads to connect highways

Postby petervdveen » Sun Jan 06, 2013 4:28 pm

Do you have a local wiki page with the current local rules?
Maybe we can take a look at that.

Besides that I do agree that these roads should be ramps!

Btw what is this cross for?
https://world.waze.com/editor/?zoom=7&l ... ,164764286
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Re: Using service roads to connect highways

Postby jasonh300 » Sun Jan 06, 2013 6:09 pm

petervdveen wrote:Btw what is this cross for?
https://world.waze.com/editor/?zoom=7&l ... ,164764286


Looks like it allows people to turn right, but not go straight or make U-Turns. It looks like cars are allowed to go straight, but maybe there's no reason to route like that and it prevents offramp to onramp routing.
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Re: Using service roads to connect highways

Postby jasonh300 » Sun Jan 06, 2013 3:28 pm

Service roads, as far as we can tell, function as a Primary Street. IOW, long distance routing won't use them at all. Being that it's grade-separated, ramps, ugly as they may be on the map, may be the best option. The only other option would be to use a highway type, but since they display as a thick line on the map, it'll make the map unreadable.
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Re: Using service roads to connect highways

Postby harling » Sun Jan 06, 2013 3:48 pm

According to the Road Types Guide (this is specific to the U.S., but other guides exist for other countries), a "Service road" is:

  • Also often known as a frontage road.
  • A smaller street found running alongside a limited access highway or other primary street.
  • Service roads allow local traffic to enter and exit driveways, parking lots, and intersecting streets without congesting thoroughfare traffic.

Specifically absent is any mention of connecting one highway to another--that is what Ramps are for. Service roads are surface streets that run parallel to highways.
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Re: Using service roads to connect highways

Postby gerben » Mon Jan 07, 2013 1:27 am

Have you never seen them before Peter? fvwazing has used this contstruction in NL at several places...
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Re: Using service roads to connect highways

Postby fvwazing » Mon Jan 07, 2013 2:34 am

Ah, yes, the "inner cross". Hardly recognizable here, with the U-turn-curves ahead of the crossing and the missing of straight-thru. 46m for the diagonal distance IS huge for a setup like that, but from what I see all the connections are right. I see room for further simplification by taking these segments out and calling the split to left or right from the same node. Connectionwise it is pretty much sane as it is.

But the type: surface-streets, be it plain streets, service or primary, are definately second choice. Make it all ramps or stretches of minor. Going north parallel to the E11 is another matter, it runs forever parallel but does not offer a connection to the major until the next big crossing is reached after a mile or so. Primary will do there, as it is clearly not preferred that cars go from the E10 to E11 in north direction or else there would have been an on-ramp very close to the crossing in question. But it must be something bigger than street with all those primarystreets connected to it. It could do with a different streetname as well or else the trafficjam-reports are indistinguishable from those on the major E11, if you do not have a different name available call it "parallel to E11".
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Using service roads to connect highways

Postby fvwazing » Sun Jan 06, 2013 12:59 pm

Pfffft... this setup is going to make nobody happy. Over a longer distance (>20km?) you will probably never get routed from one highway to another over serviceroads. Maybe you will, but only because other crossings are a mess as well. As a rule of the thumb highways (freeways, major, minor, ramps) should connect to highways without surfacestreets between them.
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Re: Using service roads to connect highways

Postby bgodette » Mon Jan 07, 2013 3:09 am

For what it's worth, I think the whole bit about "frontage roads" is unnecessary. Service roads are the red-headed step-child of Types as they're effectively unneeded as far as Routing is concerned (they behave as Street or Primary, not definitive yet) and only serve to cause confusion like this thread.

Every place I've seen them used for frontage roads running parallel to highways, the better used Type in terms of making the map visually make sense is Primary. For local-access roads for expressways, Street works (you're accessing residential streets with it). Using Service Road for alleys and delivery access is just plain the wrong Type in terms of Waze's routing, Parking Lot is better suited as #1 you don't want general routing over those segments, and #2 drivers stop/idle on them.
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Re: Using service roads to connect highways

Postby andrewkjs » Mon Jan 07, 2013 5:24 am

fvwazing, bgodette and everyone else, thanks for the advice and pointers, especially the tip about simplifying the left & right split from the same node. I'll need to keep this in mind in my future edits. And it looks like the use of service roads shouldn't be different from the rest of the world.

The CM a4xrbj1 just posted a note in our group that he's traveling and not able to attend to unlock requests right now. I've posted an unlock request here http://world.waze.com/forum/viewtopic.php?f=265&t=36561 and I'll start updating the roads once they have been unlocked.
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