# Japan National Route 424

National Route 424 (国道424号, Kokudō Yonhyaku ni-jūyongō) is a national highway located entirely within Wakayama Prefecture, Japan. It connects the cities of Tanabe and Kinokawa, spanning the western side of the prefecture in a south–north routing. The highway has a total length of 113.0 kilometers (70.2 mi).

## Route description

National Route 424 is a national highway that does not leave Wakayama Prefecture. The highway connects the cities of Tanabe and Kinokawa, running south–north across the prefecture. The highway almost entirely runs through the prefecture's inland mountainous area, paralleling the coastal routing of National Route 42 and the Hanwa Expressway; however, the southernmost section of the highway between Minabe and Tanabe runs along the prefecture's west coast. The highway has a total length of 113.0 kilometers (70.2 mi), excluding its auxiliary routes.

## History

On 1 April 1982, National Route 424 was established by the Cabinet of Japan between the city of Tanabe and the former town of Uchita which has since been merged into the city of Kinokawa. In 1996 a project began to widen and straighten a winding one-lane section of the road along the Shuri River in Aridagawa. The realignment project was completed on 11 July 2012 with a total cost of 8.9 billion yen. Another project began in 2010 in Minabe to straighten and shorten the highway. The project was significantly delayed by landslides caused by Tropical Storm Talas on 5 September 2011. On 2 October 2017, the project was completed, shortening the total length of the highway by about a kilometer and a half.

## Major intersections

The route lies entirely within Wakayama Prefecture.
| Location | km | mi | Destinations | Notes |
| Tanabe | 0.0 | 0.0 | Wakayama Prefecture Route 31 – Shingu, Shirahama, central Tanabe | Southern terminus |
| Tanabe | 1.0 | 0.62 | Wakayama Prefecture Route 207 – Nagano | |
| Tanabe | 1.2 | 0.75 | Wakayama Prefecture Route 29 – Ryūjin | |
| Tanabe | 2.0 | 1.2 | National Route 42 east – to Kisei Expressway east, Hanwa Expressway north Wakayama Prefecture Route 208 – Central Tanabe | Southern end of National Route 42 concurrency |
| Tanabe | 3.6 | 2.2 | Wakayama Prefecture Route 210 east – Central Tanabe | |
| Tanabe | 5.4 | 3.4 | Wakayama Prefecture Route 199 north – to Kisei Expressway east, Hanwa Expressway north, Wakayama, Shirahama | |
| Minabe | 9.9 | 6.2 | Wakayama Prefecture Route 200 north | |
| Minabe | 10.2 | 6.3 | Wakayama Prefecture Route 201 east – Minabe Station | |
| Minabe | 10.7 | 6.6 | National Route 42 west – Wakayama, Gobō | Northern end of National Route 42 concurrency |
| Minabe | 12.3 | 7.6 | Hanwa Expressway – Shirahama, Osaka | Minabe Interchange (E42 exit 33) |
| Minabe | 15.5 | 9.6 | Wakayama Prefecture Route 30 west – Inami | Southern end of Wakayama Prefecture Route 30 concurrency |
| Minabe | 16.6 | 10.3 | Wakayama Prefecture Route 30 east – Haya, Akitsugawa | Northern end of Wakayama Prefecture Route 30 concurrency |
| Minabe | 20.5 | 12.7 | Wakayama Prefecture Route 197 west – Furui | |
| Minabe | 26.3 | 16.3 | Wakayama Prefecture Route 199 south – Tanabe | |
| Tanabe | 35.0 | 21.7 | National Route 425 east – Shingū, Nakahechi | Southern end of National Route 425 concurrency |
| Tanabe | 40.7 | 25.3 | National Route 425 west / Wakayama Prefecture Route 29 south – Inami | Northern end of National Route 425 concurrency, southern end of Wakayama Prefecture Route 29 concurrency |
| Tanabe | 44.6 | 27.7 | Wakayama Prefecture Route 29 north | Northern end of Wakayama Prefecture Route 29 concurrency |
| Hidakagawa | 59.1 | 36.7 | Wakayama Prefecture Route 26 west – to National Route 42, Gobō Wakayama Prefecture Route 194 east – Kamiubuyugawa | |
| Aridagawa | 75.1 | 46.7 | Wakayama Prefecture Route 179 west | |
| Aridagawa | 77.1 | 47.9 | Old National Route 424 north – Kainan Wakayama Prefecture Route 22 west – to Hanwa Expressway, National Route 42, Arida, Yuasa | |
| Aridagawa | 77.7 | 48.3 | National Route 480 – Arida, Kōya, Shimizu | |
| Aridagawa | 78.9 | 49.0 | Wakayama Prefecture Route 18 north – to National Route 42, Arida | |
| Aridagawa | 79.1 | 49.2 | Wakayama Prefecture Route 182 east | |
| Aridagawa | 81.1 | 50.4 | Wakayama Prefecture Route 183 east – Ohara | |
| Aridagawa | 86.8 | 53.9 | Wakayama Prefecture Route 184 east – Oishi Highland | |
| Kainan | 95.8 | 59.5 | Wakayama Prefecture Route 169 east – Kōya, Kimino | |
| Kainan | 96.0 | 59.7 | National Route 370 west / National Route 424 north (Sakai Bypass) – to National Route 42, central Kainan | Southern end of National Route 370 concurrency |
| Kainan | 96.7 | 60.1 | National Route 370 east (Nishi Kōya Kaidō) – Kōya | Northern end of National Route 370 concurrency |
| Kainan | 97.6 | 60.6 | Wakayama Prefecture Route 138 – Kuroiwa, Kimino | |
| Kainan | 102.1 | 63.4 | Wakayama Prefecture Route 10 south – Kōya, Nokami Industrial Site | Southern end of Wakayama Prefecture Route 10 concurrency |
| Kinokawa | 102.5 | 63.7 | Wakayama Prefecture Route 10 north – Wakayama, Iwade | Northern end of Wakayama Prefecture Route 10 concurrency |
| Kinokawa | 102.9 | 63.9 | Wakayama Prefecture Route 129 east – Kaito | |
| Kinokawa | 104.6 | 65.0 | Wakayama Prefecture Route 13 west – Wakayama | Southern end of Wakayama Prefecture Route 13 concurrency |
| Kinokawa | 108.7 | 67.5 | Wakayama Prefecture Route 128 north – to Keinawa Expressway, National Route 24 Wakayama Prefecture Route 130 west – Iwade | |
| Kinokawa | 109.4 | 68.0 | Wakayama Prefecture Route 3 east – Kōya, Tomobuchi | |
| Kinokawa | 111.3 | 69.2 | Wakayama Prefecture Route 13 east – Hashimoto, Katsuragi | Northern end of Wakayama Prefecture Route 13 concurrency |
| Kinokawa | 112.6 | 70.0 | Wakayama Prefecture Route 14 – Wakayama, Iwade, Nara, Hashimoto | |
| Kinokawa | 113.0 | 70.2 | National Route 24 – Wakayama, Nara, Iwade, Hashimoto Wakayama Prefecture Route 62 north – to Keinawa Expressway, Izumisano, Kindai University | Northern terminus, road continues north as Wakayama Prefecture Route 62 |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Route transition |||||