 | ||||
|---|---|---|---|---|
| 国道503号 | ||||
 | ||||
| Route information | ||||
| Length | 112.7 km[1] (70.0 mi) | |||
| Existed | 1993–present | |||
| Major junctions | ||||
| North end |   National Route 265 / National Route 315 in Takamori, Kumamoto | |||
| South end |  National Route 10 in Hyūga, Miyazaki | |||
| Location | ||||
| Country | Japan | |||
| Highway system | ||||
| ||||
 | This article relies largely or entirely on a single source. (February 2023) |
National Route 503 is a national highway of Japan connecting between Takamori, Kumamoto and Hyūga, Miyazaki in Japan, with total length has 112.7 km (70.0 mi).
- ^ "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 10 February 2020.