Japan: National Highways 一般国道 system

[nezinscot]

Request: for all of N317, could we add some waypoints for where the cycling route joins and leaves the driving route? Well we are primarily expecting users to drive to cinch, I don't see why we can't add a few more points for this popular cycling destination.

Also the cycle route is also the moped (less than 125cc) route, so it is fair to actually drive on it.

I'm assuming you are referring to the Shimanami cycling route.  https://shimanami-cycle.or.jp/  Are you asking for waypoints to be added where the bike path joins and leaves the various bridges on E76/N317Set?

[nezinscot]

I usually check to see if a road has user entries, and if I need to change a waypoint name, I move the old name to an Alt Label.  I must have failed to do this for some my recent Kyushu changes.  I'll be more vigilant about this.

Also, during my recent reviews of Kyushu and Shikoku, I eliminated some waypoints to secondary prefectural roads that were only included because they prevented VISIBLE_DISTANCE warnings.

In urban areas, primary prefectural roads can be close together.  I will skip some of them, choosing the ones that seem more important.  Criteria include the presence of a stoplight, multiple lanes, leads somewhere locally important, length of the road, etc.  The recent changes dropped some of these primary prefectural roads.


When choosing what to waypoint, my general rules are:
1) national expressways and urban expressway systems
2) national highways
3) primary prefectural roads - in most prefectures these are numbered < 100   (OSM green roads)
4) secondary prefectural roads that directly lead to expressway exits    (OSM yellow roads)
5) secondary prefectural toads or local roads that lead directly to major tourist sites - these are rare

Even with restricting the inclusion of secondary roads, waypoint density is frequently less than 2 miles between points.  In urban areas it is commonly less than a mile.

If a user wants a secondary or local road included in the waypoints, I'll likely add it.  I just need to be told the road name or location.

[michih]

When choosing what to waypoint, my general rules are:

Check this: https://travelmapping.net/devel/manual/includepts.php#intersections

I also recommend adding wps for intersecting roads heading to grade-separated roads.

[michih]

Goodness, I didn't check the number of routes before I wrote that I'll review the system. And the first one is a very long one...

Please ask if you don't get why I suggest changes. Suggestions with ? are optional.

N1:
N4 -> N4/N6 since both are in Highway Browser
N15/P10 -> N15_Tok ?
N15 -> N15_Yok
P301/P319 -> P301 would be enough since P routes are not (yet?) in HB, I won't mention that for similar situations. It's up to you to change it.
P2_N -> P2_Shi ?
P2_S -> P2_Yok ?
N16Yok -> N16_E since the concurrent main route splits off
N16/P81 -> N16_W
N1Shi_E -> C4 since it's a route of higher tier
N1Shi_W -> E84
N129 -> N129/N412
E84/N1SSH_Iry -> E84_Kaz (preferred) or E84/N1SSH
N138 -> N138_W since it's concurrent from N255
N1SSH_W -> N1SSH_Hak ? (well, you don't have to change it, it's just a recommendation to better distinguish that the route is not concurrent, I won#t mention it for similar situations)
N136/P21 -> N136
N246/N414 misses the graph connection to N414 because N414's end point is off
N139/P76 -> N139
N1Fuj/P81 -> N1Fuj
N152/P65 -> N152
E1A/N23 -> E1A
N302_E -> C2(1)
N19/N247 -> N19/N22
N302_W -> C2(25)
N302_W needs to be synced to http://www.openstreetmap.org/?lat=35.126350&lon=136.818151
N365 -> N365/N477
N164 -> N164/N477
N164_End -> Suw since N164 does not intersect here, it's just the end of N164
E25 -> ToE25
Add a wp to E25 for that connector
E23/E25 -> E25 since there is no graph connection to E23
N478/N1Kei -> N1Kei/N478
N168/P20 -> N168
HE12/P2 -> E26 since it's highest tier
Add wp b/n N1Shi_W and N129 for a road heading to E84 at http://www.openstreetmap.org/?lat=35.332869&lon=139.377338
Add wp b/n P22_E and N136/P21 for a road heading to E70 at http://www.openstreetmap.org/?lat=35.114687&lon=138.927795
Add wp for GSJ west of N139FIS at http://www.openstreetmap.org/?lat=35.133391&lon=138.648394 (closer to the rules) OR http://www.openstreetmap.org/?lat=35.132167&lon=138.644575 (would also be fine)
Replace +X399258 by two visible wps for the nearby GSJ (or maybe just one wp?)
Add one or two wps b/n P54/P67 and P74
Add wp west of P84_Shi for a GSJ at http://www.openstreetmap.org/?lat=34.954254&lon=138.367800
Replace +X471047 by a visible wp
Add wp west of N1Sei_W for GSJ at http://www.openstreetmap.org/?lat=34.937017&lon=138.308194
Add wp for GSJ b/n N1Fuj/P81 and P32 at http://www.openstreetmap.org/?lat=34.889557&lon=138.256288
Add wps for GSJs west of P64 at http://www.openstreetmap.org/?lat=34.854207&lon=138.202847 and http://www.openstreetmap.org/?lat=34.848101&lon=138.182613 and http://www.openstreetmap.org/?lat=34.845772&lon=138.166959
Remove +X872523
Move P64 wp to the underpass at http://www.openstreetmap.org/?lat=34.843963&lon=138.150351
Add wp east of N1Nis_E for a GSJ at http://www.openstreetmap.org/?lat=34.820929&lon=138.106481
Add wps east of P39 for GSJs at http://www.openstreetmap.org/?lat=34.790149&lon=138.071258 and http://www.openstreetmap.org/?lat=34.786404&lon=138.050342 and http://www.openstreetmap.org/?lat=34.784475&lon=138.028139
Remove +X757522 and +X502773
Add wps east of P61_Fuk for a GSJs at http://www.openstreetmap.org/?lat=34.770481&lon=137.977987 and http://www.openstreetmap.org/?lat=34.757604&lon=137.936128 and http://www.openstreetmap.org/?lat=34.757260&lon=137.922235
Add wp west of P61_Fuk for a GSJ at http://www.openstreetmap.org/?lat=34.747003&lon=137.894243
Replace +X516279 by a visible wp for the nearby GSJ
Add wp b/n P44_Iwa and N152/P65 for a GSJ at http://www.openstreetmap.org/?lat=34.728387&lon=137.814297
Add wp north of N421 for a road heading to a GSJ of N258 at http://www.openstreetmap.org/?lat=35.076853&lon=136.684942
Remove +X864172 since it's no longer needed
Add wp for GSJ b/n N306 and E25 at http://www.openstreetmap.org/?lat=34.864217&lon=136.439799
Also add for concurrent N25
Replace +X845776 by a visible wp for the nearby GSJ
Add wp east of N307_N for a GSJ at http://www.openstreetmap.org/?lat=34.966353&lon=136.196217
Add wp b/n P13_E and P13_W for a GSJ at http://www.openstreetmap.org/?lat=34.989846&lon=136.116394
Add wp east of P32_Kyo for a GSJ at http://www.openstreetmap.org/?lat=34.994118&lon=135.775896
Also add for concurrent N8
Add wps b/n P17_Hir and P22_Yaw for intersecting roads heading to E1A/E93 at http://www.openstreetmap.org/?lat=34.857997&lon=135.712261 and http://www.openstreetmap.org/?lat=34.868244&lon=135.727496
Add wp b/n N170_N and N168/P20 for a GSJ at http://www.openstreetmap.org/?lat=34.806717&lon=135.652826
Add wp b/n P30_Osa and P8_Osa at http://www.openstreetmap.org/?lat=34.699288&lon=135.536394 (looks important)
Also add for concurrent N163


N258:
Add wp b/n E23 and N421_W for GSJ at http://www.openstreetmap.org/?lat=35.073876&lon=136.665126

[nezinscot]

There are >1200 roads.  That's why I usually review by island or prefecture.  N1 is probably the most complicated of them all.  It connects every seaside city from Tokyo to Osaka, plus there are many bypass routes also considered part of N1.

I'm away for the next 10 days.  I'll make these changes when I return at the end of the month.

[michih]

Ok. Is the "missing wp for GSJs" a general issue of your system? Should I wait till you've added them, or should I go ahead and review the routes as I did for N1?

[Nagamasa]

I think my personal preference is to just include all numbered prefectural roads as waypoints, it's significantly harder to add them in at a later time, and most other regions do have 2nd level secondary roads mapped too FWIW.

I also do wonder if JPN should be split by prefecture or region, it is a very dense region across our projects.