Route 420 is a general national highway that runs from the intersection of Route 153 in Toyota City, Aichi Prefecture, to the intersection of Route 151 in Shinshiro City, Aichi Prefecture, passing through Kōrankei Gorge in Asuke Town, Toyota City, one of the best places in Japan to view the autumn leaves.
The total length of this 66 km road is only about 15 km, as it overlaps with Route 153, Route 257, and, if you include the lower section, Route 473.
START : Route 420 End (Arumi intersection = Route 151/257 intersection) - Arumi, Shinshiro City, Aichi Pref.
GOAL : Route 420 Start (Koromo-chō 1 N. intersection = on Route 153, 248, and 419) - Koromo-chō, Toyota City, Aichi Pref.
DATE : Early April 2024
DISTANCE : About 66 km (measured by Google Maps)
ROUTE MAP: https://www.google.com/maps/d/u/0/embed?mid=1m2i-HqKsJQytyJ2WW-wHkVLgh3QW9G8&ehbc=2E312F
00:00:00 Intro
00:03:17 Route 420 End (Arumi intersection = Route 151/257 intersection) - Arumi, Shinshiro City, Aichi Pref.
00:05:31 ← Aichi Prefectural Route 21 Toyokawa Shinshiro Line - Suzawa, Shinshiro City, Aichi Pref.
00:10:37 → Aichi Prefectural Route 436 Tsukudekiyooka Kuroze Line - Kuroze, Shinshiro City, Aichi Pref.
00:15:19 ← Aichi Prefectural Route 436 Tsukudekiyooka Kuroze Line - Furi, Shinshiro City, Aichi Pref.
00:19:05 ← Aichi Prefectural Route 436 Tsukudekiyooka Kuroze Line - Tadamochi, Shinshiro City, Aichi Pref.
00:21:13 Hiromi Yana - Tadamochi, Shinshiro City, Aichi Pref.
00:25:12 → Aichi Prefectural Route 435 Tsukudeyasunaga Ebi Line - Aigō, Shinshiro City, Aichi Pref.
00:27:14 ← Aichi Prefectural Route 435 Tsukudeyasunaga Ebi Line - Aigō, Shinshiro City, Aichi Pref.
00:29:38 Ōwa Bridge (Tōkaizugawa River) L=32.6m / Route 257 Overlap End - Damine, Shitara-chō, Kitashitara District, Aichi Pref.
00:35:07 ← Aichi Prefectural Route 35 Okazaki Shitara Line - Tsukude Moriyoshi, Shinshiro City, Aichi Pref.
00:37:49 Toyokuni, Shitara-chō, Kitashitara District, Aichi Pref.
00:42:11 Toyokuni Kōryū Center (Former Toyokuni Elementary School) - Toyokuni, Shitara-chō, Kitashitara District, Aichi Pref.
00:46:33 Shin-Dando Tunnel L=1403m - Damine, Shitara-chō, Kitashitara District, Aichi Pref.
00:48:07 Azō-chō, Toyota City, Aichi Pref.
00:50:32 ← Route 473 - Azō-chō, Toyota City, Aichi Pref.
00:53:16 → Aichi Prefectural Route 367 Nashino Kawamote Line / Nashinoshinbashi Bridge L=11.3m - Nashino-chō, Toyota City, Aichi Pref.
00:56:17 ← Aichi Prefectural Route 477 Higashiōmi Okazaki Line - Higashiōmi-chō, Toyota City, Aichi Pref.
00:59:01 Miyama Chaya (Tea House) - Higashiōmi-chō, Toyota City, Aichi Pref.
01:03:11 → Aichi Prefectural Route 364 Damine Higashiōmi Line - Higashiōmi-chō, Toyota City, Aichi Pref.
01:05:38 Gamo Hydroelectric Power Plant / → Aichi Prefectural Route 362 Ōnuma Asuke Line - Ajikyō-chō, Toyota City, Aichi Pref.
01:08:08 Kōrankei Ochibe Parking Lot - Asuke-chō, Toyota City, Aichi Pref.
01:08:51 ↘ Aichi Prefectural Route 366 Odo Asugawa Asuke Line - Asuke-chō, Toyota City, Aichi Pref.
01:09:16 ← Kōrankei Gorge (One of the best places in the Japan for fall foliage) - Asuke-chō, Toyota City, Aichi Pref.
01:10:23 Route 153 Overlap - Asuke-chō, Toyota City, Aichi Pref.
01:12:52 ← Aichi Prefectural Route 39 Okazaki Asuke Line｜→ Aichi Prefectural Route 358 Wachibara Chikaoka Line - Chikaoka-chō, Toyota City, Aichi Pref.
01:17:37 → Aichi Prefectural Route 344 Hisagi Nakagane Line - Nakagane-chō, Toyota City, Aichi Pref.
01:17:53 ← Aichi Prefectural Route 487 Matsudairashiga Nakagane Line - Nakagane-chō, Toyota City, Aichi Pref.
01:19:53 ← Aichi Prefectural Route 345 Nakagane Dōdo Line - Nakagane-chō, Toyota City, Aichi Pref.
01:20:59 Ishino Post Office - Chikaraishi-chō, Toyota City, Aichi Pref.
01:21:40 → Sanage Green Road (Aichi Prefectural Route 6 Chikaraishi Nagoya Line) - Chikaraishi-chō, Toyota City, Aichi Pref.
01:23:13 → Aichi Prefectural Route 355 Shimasaki Toyota Line - Kanpachi-chō, Toyota City, Aichi Pref.
01:24:18 C3 TŌKAI-KANJŌ EXPWY (Route 475) - Kanpachi-chō, Toyota City, Aichi Pref.
01:25:25 Hiratobashichō mabase intersection - Hiratobashi-chō, Toyota City, Aichi Pref.
01:25:50 ← C3 TŌKAI-KANJŌ EXPWY, Toyota-Kanpachi IC - Kanpachi-chō, Toyota City, Aichi Pref.
01:26:24 Hirato Ōhashi Bridge L=390.5m - Fusō-chō, Toyota City, Aichi Pref.
01:28:56 → Aichi Prefectural Route 346 Koshido Station Line - Koshido-chō, Toyota City, Aichi Pref.
01:29:23 Koshido Pump Plant intersection - Koshido-chō, Toyota City, Aichi Pref.
01:32:19 → Route 419 - Jinnaka-chō, Toyota City, Aichi Pref.
01:33:19 ← Aichi Prefectural Route 343 Norisada Toyota Line - Kubo-chō, Toyota City, Aichi Pref.
01:34:23 → Aichi Prefectural Route 342 Toyotashi Station Line - Kita-machi, Toyota City, Aichi Pref.
01:34:55 Route 420 Start (Koromo-chō 1 N. intersection = on Route 153, 248, and 419) - Koromo-chō, Toyota City, Aichi Pref.