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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 (31.4 mi)
Existed	1982–present
Major junctions
South end	National Route 25 in Kita-ku, Osaka
	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 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

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 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
	Kita-ku, Osaka	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
	Yodogawa-ku, Osaka	4.2	2.6	—	Shin-Ōsaka	Shin-Osaka Station access road
	Suita	7.0	4.3	—	Esaka	National Route 479
	Suita	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
Ikeda	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