Japan National Route 350

File:R350-2.JPG on Sado Island]]

National Route 350 mainly functions as the main highway on Sado Island; however, it is connected by roll-on/roll-off ferries that cross the Sea of Japan to its termini on Honshu at Jōetsu and Niigata.{{cite web|title=海の上にも国道？|trans-title=Is it a national highway on the sea?|url=https://www.mlit.go.jp/common/000110941.pdf|publisher=Ministry of Land, Infrastructure, Transport and Tourism|language=ja|date=April 2010|accessdate=1 February 2021}} It has a total length of {{convert|51.9|km|mi|sp=us}} on land, but a total length of {{convert|163.2|km|mi|sp=us}} with the distance traveled by the Sado Steam Ship across the Sea of Japan factored in.

The car ferry between Niigata and Ryōtsu commenced service in March 1967.{{cite web|title=佐渡汽船の歴史・創業ストーリー|trans-title=History and founding story of Sado Kisen|url=https://strainer.jp/companies/3203/history|publisher=Strainer|language=ja|date=2016|accessdate=3 February 2021}} The opening of this connection led to an increase of vehicular activity on the island. In response, officials on Sado Island sought assistance from the national government to improve the roads of the island; however, the law governing Japan's national highways only allowed for highways that were connected to core cities, special cities, and prefectural capitals to be designated as national highways. These officials petitioned the then-Secretary-General of the Liberal Democratic Party, Kakuei Tanaka, to give the island a national highway by finding a loophole in the law. The loophole was that if the highway began in Niigata (the prefecture's capital city) and ended in Jōetsu (a special city) it did not matter where the highway was routed between. National Route 350 was established by the Cabinet of Japan in 1975 between the cities of Niigata and Jōetsu via the Sado Island ferry ports at Ryōtsu and Ogi, giving the island its only national highway.{{Cite act|title=一般国道の路線を指定する政令|trans-title=Cabinet Order Designating General National Routes|via=Wikisource|url=https://ja.wikisource.org/wiki/%E4%B8%80%E8%88%AC%E5%9B%BD%E9%81%93%E3%81%AE%E8%B7%AF%E7%B7%9A%E3%82%92%E6%8C%87%E5%AE%9A%E3%81%99%E3%82%8B%E6%94%BF%E4%BB%A4|year=1965|language=ja|accessdate=3 February 2021}}{{cite news|title=全国「国道扱いのフェリー」5選 そもそもなぜフェリーが国道？ 不思議なルートも|trans-title=Five "Ferries treated as National Roads" in Japan. Why is the ferry a national road in the first place? Mysterious route|url=https://trafficnews.jp/post/94273/3|newspaper=Traffic News|language=ja|date=7 March 2020|accessdate=3 February 2021}}

The route lies entirely within Niigata Prefecture.

{{JPNinttop|nopref=yes|length_ref={{google maps|title=National Route 350 (Niigata-Sado)|url=https://www.google.com/maps/dir/37.9215706,139.0468395/37.8157661,138.2804244/@37.8158986,138.2796098,18.29z/data=!4m29!4m28!1m25!3m4!1m2!1d138.4352831!2d38.0813829!3s0x5ff35c588e65a6a5:0x53f3faad553bfc0c!3m4!1m2!1d138.3640641!2d38.0220284!3s0x5ff366d0d38492df:0x1c344e76be0dc3b7!3m4!1m2!1d138.369864!2d38.0124884!3s0x5ff3613190740483:0xb17efe81cecf04d9!3m4!1m2!1d138.3064724!2d38.0065658!3s0x5ff36417b035cf35:0x8221e17395c03882!3m4!1m2!1d138.2861805!2d37.8210884!3s0x5ff48725018b9e65:0x122cd935c2218f47!1m0!3e0|accessdate=1 February 2021}}{{google maps|title=National Route 350 (Jōetsu)|url=https://www.google.com/maps/dir/37.1826846,138.2525455/37.1653475,138.256555/@37.1735207,138.2393999,14.75z/data=!4m2!4m1!3e0|accessdate=1 February 2021}}}}

{{JPNint

|location_special=Niigata

|lspan=3

|km=0.0

|type=trans

|road={{jct|country=JPN|Route|7|Route|8|Route|17|Route|113|Route|116|Route|289|Route|402|dir1=ends|dir2=ends|dir3=ends|dir4=ends|dir5=south|dir6=east|dir7=south}}

|notes=Northern terminus, highway continues south as National Route 116, northern end of concurrency with National Routes 7, 8, 17, and 113

}}

{{JPNint

|km=0.9

|type=concur

|road=File:Shinkansen_jre.svg{{jct|country=JPN|Route|7|Route|8|Route|17|dir1=north|dir2=south|dir3=south}} – Niigata Station

|notes=Southern end of concurrency with National Routes 7, 8, and 17

}}

{{JPNint

|km=1.3

|type=concur

|road=File:JP Expressway E7.svg{{jct|country=MEX|extra=airport}}{{jct|country=JPN|Route|113|dir1=east}} – to Nihonkai-Tōhoku Expressway, Niigata Airport

|notes=Southern end of concurrency with National Route 113

}}

{{jctbridge

|location_special=Sea of Japan

|km=3.0

|km2=67.6

|bridge=File:Japan_ferry_sign.png Sado Steam Ship (Niigata–Sado Ferry)

}}

{{JPNint

|location_special=Sado

|lspan=18

|km=67.6

|type=concur

|road=Niigata Prefecture Route 45 / Niigata Prefecture Route 65 south – Suizu, Mano

|notes=Northern end of concurrency with Niigata Prefecture Route 45

}}

{{JPNint

|km=68.4

|type=concur

|road=Niigata Prefecture Route 45 / 81 north – Futatsugame, Washizaki

|notes=Southern end of concurrency with Niigata Prefecture Route 45, northern end of concurrency with Niigata Prefecture Route 81

}}

{{JPNint

|km=71.8

|road={{jct|country=MEX|extra=airport}} Niigata Prefecture Route 282 south – Sado Airport

|notes=

}}

{{JPNint

|km=72.5

|type=concur

|road=Niigata Prefecture Route 81 south – Niibo, Tokinomori Park

|notes=Southern end of concurrency with Niigata Prefecture Route 81

}}

{{JPNint

|km=78.2

|road=Niigata Prefecture Route 306 west – Aikawa, Kubota

|notes=

}}

{{JPNint

|km=78.7

|road=Niigata Prefecture Route 181 – Ryōtsu Port, Niibo, Nakaoki

|notes=

}}

{{JPNint

|km=79.9

|road=Niigata Prefecture Route 381 south – Niibo, Hatano

|notes=

}}

{{JPNint

|km=81.1

|road=Niigata Prefecture Route 194 south – Kanamaru

|notes=

}}

{{JPNint

|km=84.4

|road=Niigata Prefecture Route 305 north – Nagaki

|notes=

}}

{{JPNint

|km=86.2

|road=Niigata Prefecture Route 45 north – Aikawa

|notes=

}}

{{JPNint

|km=90.6

|road=Niigata Prefecture Route 194 north – Chigusa, Kanamaru

|notes=

}}

{{JPNint

|km=92.7

|type=concur

|road=Niigata Prefecture Route 65 north – Ryōtsu Port, Hatano

|notes=Northern end of Niigata Prefecture Route 65 concurrency

}}

{{JPNint

|km=93.2

|type=concur

|road=Niigata Prefecture Route 65 south – Akadomari, Mano Goryo

|notes=Southern end of Niigata Prefecture Route 65 concurrency

}}

{{JPNint

|km=103.3

|road=Niigata Prefecture Route 432 east – Shizudaira, Sasagawa

|notes=

}}

{{JPNint

|km=107.0

|road=Niigata Prefecture Route 456 east – Shimokawamo, Osaki

|notes=

}}

{{JPNint

|km=108.6

|road=Niigata Prefecture Route 287 east – Hamochi Port, Hamochihongo

|notes=

}}

{{JPNint

|km=113.1

|road=Niigata Prefecture Route 543 west – Sawasakibana, Kanedashinden

|notes=

}}

{{JPNint

|km=115.0

|road=Niigata Prefecture Route 45 – Akadomari, Hamochi Port, Central Ogi

|notes=

}}

{{jctbridge

|location_special=Sea of Japan

|km=115.7

|km2=161.2

|bridge=File:Japan_ferry_sign.png Sado Steam Ship (Sado–Jōetsu Ferry)

}}

{{JPNint

|location_special=Jōetsu

|lspan=4

|km=161.2

|road=Niigata Prefecture Route 468 – Kakizaki, Ōgata

|notes=

}}

{{JPNint

|km=161.6

|road=Niigata Prefecture Route 216 – Kubiki, Naoetsu Station

|notes=

}}

{{JPNint

|km=162.3

|road=File:Japanese National Route Sign 0253.svg Niigata Prefecture Route 288 – to National Route 253, Tōkamachi, Uragawara, Naoetsu Station

|notes=

}}

{{JPNint

|km=163.2

|road={{jct|country=JPN|Route|8}} – Nagaoka, Kashiwazaki, Toyama, Itoigawa
File:Shinkansen_jre.svg{{hairspace}}File:Shinkansen_jrw.svg{{jct|country=JPN|Route|18|dir1=south}} – Jōetsumyōkō Station, Nagano, Myōkō

|notes=Southern terminus

}}

{{Jctbtm|keys=concur,trans|col=8}}

• {{portal-inline|Japan}}
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{{reflist}}

• {{commons-inline|Category:Route 350 (Japan)}}

{{National Routes of Japan|350}}

350

Category:Roads in Niigata Prefecture

Category:1975 establishments in Japan