SuperDave1426 wrote:Also, one of the examples I provided was for a roundabout. A roundabout only has the same number of nodes as there are roads connected to it. When you've got two roads involved (like in my example), you're only going to have two nodes. The "add roundabout" function in the WME isn't going to create an extra blank junction node. The Toolbox "redo roundabout" function is also does not create an extra node because it's not necessary (no segment is actually connecting back to "the same node").
Timbones wrote:CBenson wrote:I've seen routing issue, like routing the wrong way on roundabouts with only two roads that connect to them. I do think they are a problem.
Did it actually route the wrong way, or was the purple route in WME drawn the wrong way?
SuperDave1426 wrote:kentsmith9 wrote:Otherwise we have to add a node in the middle of one of the two segments on the roundabout. That seems like unnecessary work.
Not to mention that the minute you do that, you create a roundabout with non-sequential segment IDs, and I've read that can cause problems with navigation through a roundabout. The Toolbox will specifically flag such a roundabout as one which could cause potential problems (and if you use the "redo roundabout" tool, it will (quite properly, IMO) remove the extra node you just added because there's not actually a road attached to it).
SuperDave1426 wrote:I suppose it could be managed by temporarily creating a third road leading into it and then deleting that road once the roundabout is created, but to me that falls back into what kentsmith9 was saying about being more unnecessary work.
SuperDave1426 wrote:Since when is a roundabout about how many roads enter it? A roundabout is a big honkin' (or in some cases, a small honkin' ) circular road, running one way, around something in the middle of it. Other roads attach to it and those coming from the entering roads are required to yield to the traffic already in the roundabout.
In U.S. dictionaries the terms "roundabout", "traffic circle" and "rotary" are synonyms. There's no requirement that there be more than two roads attached.
SuperDave1426 wrote:One question, though, and I didn't see an answer to this the last time we were discussing it: You had indicated that in the past you've seen that to be the case. Is it, in fact, still the case now? Have you seen any recent occurrences of whatever the problem behavior is that you've seen? It could very well be that it's already been fixed.
SuperDave1426 wrote:Then can I make the request that when you're arguing against two-road roundabouts that you drop that as a reason? If it's no longer happening, then it seems to me that it's no longer a valid reason to use in a "do it or not" type of consideration. But maybe that's just me.
sketch wrote:dbraughlr wrote:Let's consider first a one-way terminal loop.
What is the known navigation error in this situation?
How do you correct it?
I'm not sure what the problem would be on a one-way terminal loop, if any, but knowing which way to go from a dead-end isn't really a problem.
dbraughlr wrote:A ramp must be connected at both ends and the junction at one end must have a freeway/highway/ramp segment.
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