Author Topic: Japan: National Highways 一般国道 system  (Read 71 times)

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Offline nezinscot

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Japan: National Highways 一般国道 system
« on: April 06, 2021, 12:34:55 pm »
All of my driving in Japan has been on the national highway system and on prefectural roads, not the expressways. I wanted to add this mileage but did not find a highway system for the "common" national highways.

Is anyone working on a highway system for the 55000+ km of national highways?  If no one is and you all feel the system is needed, I would be willing to help with the task.

I speak, read, and write intermediate level Japanese and would be willing to use this painfully acquired skill to dig through the ministry websites and GIS systems for original sources.  I am also familiar with the problems related to Japanese street naming and addresses.  The file creation and manipulation part of the task shouldn't be a problem because I spent years working in science and engineering-related IT.

The work would also help me improve my Japanese. I was definitely never taught highway-related vocabulary in class...

Offline michih

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Re: Japan: National Highways 一般国道 system
« Reply #1 on: April 06, 2021, 01:58:21 pm »
Great news :) si404 developed the existing systems. I think he will answer what he thinks about it.

General note:

The requirements for developing new systems are described here: https://travelmapping.net/participate.php?u=michih&#hwydatamanager

When you reach stage 5 (I guess you are currently at stage 3?), jpntk and jpne could be your candidates for the peer-review:
https://forum.travelmapping.net/index.php?topic=3004
https://forum.travelmapping.net/index.php?topic=3668

I started the jpne system peer-review last May but gave up quite soon and will not work on it again any time soon.

Offline nezinscot

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Re: Japan: National Highways 一般国道 system
« Reply #2 on: April 06, 2021, 05:46:37 pm »
I'm at level 4.  I read the developer manual before I volunteered so that I could have an idea of what the work might entail.  I no doubt need to give it another close reading.

Japanese numbered highways have some interesting quirks --- most intersecting roads are nameless, roads can span multiple islands, mountain roads can use widely divergent paths for each direction, roads may have two options (one a new tunnel the other the old twisty mountain road), ridge roads often wind back and forth across prefectural borders, etc.  At least the GSV coverage is good.

There are 47 prefectures, so a complete Japanese system would be a mini-US.  And if we include the extensive train and metro systems, the task gets even bigger.