Nikkō Kaidō
In 1988 an ordinance was put in place along the Nikkō Kaidō that forbade any new installation of large advertisements along tree-lined sections of the road. On 16 May 2018 a section of the highway was rerouted to protect the Cedar Avenue of Nikkō, a protected tree-lined section of the original Nikkō Kaidō that was being degraded by the heavy automobile traffic of the national highway.