National Route 14 no relation Japan National Route 6
Route description
Tokyo
The southern terminus of National Route 4 lies at Nihonbashi, the kilometer zero of Japan in Chūō, Tokyo. The marker here signifies the terminus of national highways including National Route 1, National Route 6, National Route 14, National Route 15, National Route 17, and National Route 20. Of the mentioned highways, three travel concurrently with National Route 4 from Nihonbashi: National Routes 6, 14, and 17. 
Just north of the starting point, National Route 17 leaves the concurrency continuing north while National Route 4, along with National Routes 6 and 14, turn east on to Edo-dōri. Three blocks from there Edo-dōri intersects Shōwa-dōri. National Route 4 turns on to Shōwa-dōri leaving the Edo-dōri concurrency with National Routes 6 and 14. Traveling north along Showa-dōri, National Route 4 serves as a frontage road to the Ueno Route of the Shuto Expressway system between Chūō and Taitō. The Ueno Route merges in to National Route 4 just to the northeast of Ueno Station. The highway then crosses over the Sumida River into Adachi. From the northern side of the river to Utsunomiya, the highway is known as the Nikkō Kaidō. In the ward the highway crosses beneath the Central Circular Route of the Shuto Expressway system, with an interchange with the expressway's frontage road. National Route 4 travels north through Adachi, roughly paralleling the Tobu Skytree Line. It then curves to the northwest, crossing over the Kena River into the city of Sōka in Saitama Prefecture.
no relation