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 inKita-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 inKameoka, 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 anational highway ofJapan connectingKita-ku, Osaka andKameoka, Kyoto in theKansai region of Japan.

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

The Minō Toll Road is a 7.2-kilometer-long (4.5 mi) two-lane toll road inMinoh, Osaka that connects theShin-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]

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

Much of what is now National Route 423 was part of the Settan-kaido, a road linking Ikeda in what wasSettsu Province and Kameoka in what was thenTanba 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 extendedMidōsuji Line to accommodate automobile traffic fromShin-Ōsaka Station into central Osaka. Later in the decade, Shinmidō-suji was extended north again along with the Midōsuji Line toSuita were the venue for theExpo '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]

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– toChūgoku 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 theMinō 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

The entire toll road is inOsaka 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 ExpresswayIkeda 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 toNational Route 423 (main route)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access

• Minō Toll Road

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• Regional High-Standard Highways in Japan
• Roads in Osaka Prefecture
• Roads in Kyoto Prefecture
• 1982 establishments in Japan

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• Short description matches Wikidata
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