My understanding is that there is a bug/undesired effect with roundabouts that if different exits/entrances are connected to the same node it will throw off the exit number count. There does not appear to be anything currently in the wiki to reflect this.

Can we add a small blurb into the wiki to address this issue in the Entrance and exit road segments section, I would appreciate any wording adjustment to optimize the message.

"When constructing a Roundabout avoid having entrance segments connect at the same node as a different exit segment as this will cause incorrect instructions in waze"

Thoughts?

I have drafted a revision of the section on Understanding Navigation Instructions. The main reason for this was because the example given for a roundabout with three nodes being normal from node 1 to 3 but not normal from node 3 to 1 is mathematically impossible. I also wanted to include updated pictures (stored under different filenames) and reorder things a tiny bit in order to be more logical. On the whole this section is very helpful, but I thought I could improve things a little, especially since a roundabout being normal and not normal at the same time is hard to understand. Let me know what you guys think!

https://wiki.waze.com/wiki/User:Kartogr ... abouts/USA

PesachZ wrote:Good work so far, I want to also point you to some additional content which may be incorporated here as well from the Interactive junction instruction algorithm.

Thanks, PesachZ. I added the content on roundabout angles to my draft here. https://wiki.waze.com/wiki/User:Kartogr ... abouts/USA

Thanks, Patti. Do you have any more info on what would need to be modified? Has the normal range of ±15° changed?

I made the change proposed above to the section https://wiki.waze.com/wiki/Roundabouts/ ... structions

Yes, something has definitely changed. This roundabout is also giving non-normal instructions, despite all its angles being within 5° of right angles:

https://www.waze.com/editor/?env=usa&lo ... 2,83402003

Kartografer wrote:Thanks, Patti. Do you have any more info on what would need to be modified? Has the normal range of ±15° changed?

Came on searching if there were changes recently. A roundy I use pretty regularly acted as a normal with turn instructions. This morning I got take first exit, second exit on way home. Nobody has touched the roundy. The way I understand the angles, it is all within 90, +-15 degrees.

https://www.waze.com/editor/?env=usa&lo ... 783&zoom=6

Since a Roundabout is not a Limited Access Interchange, two Freeways should never meet at a roundabout; however, it is conceivable that a Freeway might begin or end at one.

Since the instructions say to take connecting ramps into consideration, it actually becomes quite possible for two freeways to meet at a roundabout. Here is an example of one in Kingston, NY. https://www.waze.com/editor/?env=usa&lo ... 7,74116805

The guidance here would suggest that roundabout should be classed as Freeway, which clearly isn't logical. I propose that the page be revised to remove the sentence quoted above; to replace "If the two highest-type segments have the same type, use that type." with "If the two highest-type segments have the same type, use that type, but in no event higher than Major Highway."; and to add an example with two freeways (one via a ramp) to the example table.

I like that. It would have the added benefit of allowing us to remove the special exception for when all direct connections are ramps.

Looks like some good work going on with updates to this page. I wanted to reply that I would welcome any updates and improvements to the roundabout pages I initially worked on. I trust this team's decision on changes since I have not been tracking the roundabout operations in some time.