Japan National Route 423

National Route 423
国道423号
新御堂筋 (Shinmidō-suji)
National Route 423 highlighted in red
Route information
Length	50.6 km[1] (31.4 mi)
Existed	1982–present
Major junctions
South end	National Route 25 in Kita-ku, Osaka
Major intersections	National Route 1 National Route 479 National Route 171 Shin-Meishin Expressway National Route 372 / Kyoto Jūkan Expressway
North end	National Route 9 in Kameoka, Kyoto
Location
Country	Japan
Highway system
National highways of Japan Expressways of Japan
← National Route 422 → National Route 424

National Route 423 (国道423号, Kokudō Yonhyaku ni-jusangō) is a national highway of Japan connecting Kita-ku, Osaka and Kameoka, Kyoto in the Kansai region of Japan.

Route description

National Route 423 has a total length of 50.6 kilometers (31.4 mi).

Minō Toll Road

Main article: Minō Toll Road

The Minō Toll Road is a 7.2-kilometer-long (4.5 mi) two-lane toll road in Minoh, Osaka that connects the Shin-Meishin Expressway to the southern limits of the city via a tunnel under Mount Minō. It is a part of Route 423 that is tolled and maintained by the Osaka Prefectural Road Corporation.^[2]

Shinmidō-suji

The Shinmidō-suji at its junction with Japan National Route 1 in Kita-ku.

The Shin-Yodogawa Great Bridge carries Route 423 and the Midōsuji Line over the Yodo River.

Osaka Metro Midōsuji Line train running between either direction of Shin-Midōsuji

The Shinmidō-suji is a 7.2-kilometer-long (4.5 mi) controlled-access highway that runs from the northern terminus of the Midōsuji in Kita-ku to the southern terminus of the Minō Toll Road in Minoh. From Kita-ku to Toyonaka, the median of the highway is utilized by the Midōsuji Line and Kita-Osaka Kyuko Railway.

History

Much of what is now National Route 423 was part of the Settan-kaido, a road linking Ikeda in what was Settsu Province and Kameoka in what was then Tanba Province.^[3]

In 1964, the portion of the route between Kita-ku and Osaka Prefecture Route 9, known as the Shinmidō-suji, was built alongside the extended Midōsuji Line to accommodate automobile traffic from Shin-Ōsaka Station into central Osaka. Later in the decade, Shinmidō-suji was extended north again along with the Midōsuji Line to Suita were the venue for the Expo '70 was. National Route 423 was established in 1982 along the Shinmidō-suji, the planned Minō Toll Road, and the older Settan-kaido.^[4]

The Minō Toll Road section was opened to traffic on 30 May 2007 between Osaka Route 9 and the northern terminus at the Ikeda–Minoh route of National Route 423, completing the route.^[5] On 10 December 2017 the highway was connected to the Shin-Meishin Expressway at the northern terminus of the Ikeda–Minoh route and the toll road.^[6]

List of major junctions

Prefecture	Location	km	mi	Exit	Name	Destinations	Notes
Osaka	Kita-ku, Osaka	0.0	0.0	—	Umeshin-minami	National Route 25 south (Midōsuji)	Southern terminus; traffic can only travel southbound on Midōsuji
		0.2	0.12	—	Umeshin-higashi	National Route 1 (Sonezaki-dori)	Partial interchange; southern end of controlled-access highway segment
	Yodo River	2.31 3.06	1.44 1.90	Shin-Yodogawa Great Bridge
	Yodogawa-ku, Osaka	3.4	2.1	—	Nishinakajima	Osaka Prefecture Route 16 (Yodogawa Route)	Northbound exit, southbound entrance
		4.2	2.6	—	Shin-Ōsaka	Shin-Osaka Station access road
	Suita	7.0	4.3	—	Esaka	National Route 479
		11.0	6.8	—	Momoyamadai	Osaka Prefecture Route 35 (Toyonaka-Settsu Route)
	Toyonaka	12.6	7.8	—	Senri	Osaka Prefecture Route 2– to Chūgoku Expressway
	Minoh	15.3	9.5	—	Minō	National Route 171 – Kyoto, Kobe	Northern end of controlled-access highway segment
		16.2	10.1	—	Hakushima	Osaka Prefecture Route 9	Southern terminus of the Minō Toll Road; northern terminus of Shinmidō-suji; southbound entrance, northbound exit
		23.4	14.5	13	Minō-Todoromi	National Route 423 south (Ikeda-Minoh route) / Shin-Meishin Expressway – Kyoto, Tsuyama, Okayama, Ikeda, Toyono	Northern terminus of the Minō Toll Road
	Toyono	21.0	13.0	—	Kanaishibashi	Osaka Prefecture Route 4
		22.7	14.1	—	Kishiroguchi	Osaka Prefecture Route 110 south
		23.2	14.4	—	Kishiroguchi	Osaka Prefecture Route 109 east
		24.4	15.2	—	Myokenguchi	Osaka Prefecture Route 605 west
Kyoto	Kameoka	27.9	17.3	—	Yunohara	Kyoto Prefecture Route 733 east
		30.5	19.0	—	Waroji	Kyoto Prefecture Route 732 west
		36.3	22.6	—	Sogabe	Kyoto Prefecture Route 407
		38.0	23.6	13	Kameoka	National Route 372 west / Kyoto Jūkan Expressway	Southern end of Route 372 concurrency; interchange
		38.1	23.7	—	Kazanokuchi	Kyoto Prefecture Route 406 west
		39.1	24.3	—	Kazuka	National Route 9 (San'indō) / Kyoto Prefecture Route 403 east	Northern terminus; northern end of Route 372 concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

Ikeda–Minoh route

The entire toll road is in Osaka Prefecture.

Location	km	mi	Exit	Name	Destinations	Notes
Ikeda	0.0	0.0	—	Kibechō	National Route 173	Southern terminus
	0.3	0.19	11-14	Ikeda-Kibe Daiichi	Hanshin Expressway Ikeda Route	Northbound entrance, southbound exit
Minoh	6.2	3.9	13	Minō-Todoromi	National Route 423 / Shin-Meishin Expressway – Kyoto, Tsuyama, Okayama, Ikeda, Toyono	Northern terminus of the Ikeda-Minoh route
Through to National Route 423 (main route)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access

References

1. "一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 11 February 2020.
2. "箕面有料道路（グリーンロード）". Osaka Prefectural Road Corporation (in Japanese). Archived from the original on 26 August 2019. Retrieved 31 July 2019.
3. "Settan". Retrieved 6 August 2019.
4. "一般国道の路線を指定する政令". Retrieved 6 August 2019.
5. "Mino Tunnel Construction Project [Osaka Prefecture]". Retrieved 3 August 2019.
6. "E1A新名神高速道路（高槻JCT・IC～川西IC間）が平成29年12月10日（日曜）に開通します". Retrieved 31 July 2019.

See also

• Minō Toll Road

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