Changeset: 141025334
improved alignments and tagging, corrected wrong classifications in accordance with the 2021 Highway Classification Guidance (part 6)
Closed by xephos1one
Tags
changesets_count | 565 |
---|---|
closed:improveosm:tr | 1 |
created_by | iD 2.27.1 |
host | https://www.openstreetmap.org/edit |
imagery_used | Bing Maps Aerial;Bing Streetside |
locale | de |
resolved:outdated_tags:incomplete_tags | 1 |
source | streetlevel imagery;streetside;aerial imagery |
Discussion
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Comment from Minh Nguyen
Please be careful remodeling intersections to include dual carriageways. This changeset appears to have broken a number of route relations. Additionally, the “tuning fork” or “pencil tip” modeling that led to this breakage is controversial globally and not preferred among mappers local to California. https://community.openstreetmap.org/t/pencil-tip-intersections/1512
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Comment from xephos1one
Thanks for notifying me about the missing relation, I can't find any other broken ones besides the one you told me about on Discord that you fixed already.
I always check on any relations that might be impacted by my edits, this one seems to have slipped through. I'll double check them from now on.Regarding the intersection mapping I just did what is recommended, also by the Mapbox Guideline.
The pencil tip style you prefer isn't great either, as it creates sharp turns when in reality there aren't any.
I won't change such existing intersections in California to the other style in future.
How do professional Maps/routers like TomTom handle such intersections? -
Comment from Minh Nguyen
The terminology is a bit confusing; I think “pencil tip” actually refers to the style you applied. TomTom and Mapbox have historically been the main proponents of this style, though Mapbox is no longer active in mapping intersections.
As mentioned in that forum thread, routers have long accounted for the sharp turns you’re concerned about. The OSRM and Valhalla routers (used by Mapbox) average out the turn angle by looking at points further away from the intersection. Ironically, the pencil tip style sometimes foils this heuristic, as well as the heuristic for consolidating a complex intersection so you can hear “make a U-turn” instead of “turn left then turn left”.
On another level, the disagreement is over whether we should model how self-driving cars would travel through the intersection, or hew more closely to the physical separation principle. One reason mappers in California have complained about the pencil tip style is that it makes it difficult to distinguish the small traffic islands that are commonplace at an intersection. This is not so interesting to self-driving cars perhaps, but mappers are trying to think of a broader range of possible uses for the map.
I appreciate your openness to feedback. I would suggest continuing this discussion in the forum thread, because a changeset comment thread is unlikely to result in any broader changes anyways.
- Cochrane Road (1206381681), v1
- Monterey Road (1206381682), v1
- Cochrane Circle (1206381683), v1
- Cochrane Circle (1206381684), v1
- Monterey Road (1206381685), v1
- Jarvis Drive (1206381686), v1
- Monterey Road (1206381687), v1
- Monterey Road (1206381688), v1
- Monterey Road (1206381689), v1
- Monterey Road (1206381690), v1
- Monterey Road (1206381691), v1
- 1206381692, v1
- 1206381693, v1
- Monterey Road (1206381694), v1
- Monterey Road (1206381695), v1
- Garden Way (8941145), v7
- Cochrane Circle (8961126), v5
- Monterey Road (8964285), v29
- Old Monterey Road (26664556), v15
- 138003781, v5
Relations (13)
- 16307096, v1
- 16307097, v1
- 16307098, v1
- 16307099, v1
- 16307100, v1
- 16307101, v1
- Highway 101 Corridor (149407), v338
- VTA 87: Main & De Witt => Burnett Avenue (8507309), v28
- VTA 87: Burnett Avenue => Main & De Witt (9934297), v23
- 12139710, v2
5335130, v312139709, v212851400, v2
- 11178711632, v1
- 11178711633, v1
- 11178711634, v1
- 11178711635, v1
- 11178711636, v1
- 11178769237, v1
- 11178769238, v1
- 11178769239, v1
- 11178769240, v1
- 11178769241, v1
- 11178769242, v1
- 11178769243, v1
- 11178769244, v1
- 11178769245, v1
- 11178769246, v1
- 11178769247, v1
- 11178769248, v1
- 11178769249, v1
- 11178769250, v1
- 11178769251, v1
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