From July 20, 1972, routes operating from Kougyo High School (currently Tanabe High School) to Higashi, and Kusauchi-guchi to Kusauchi shifted their routes to the newly connected National Highway 307.
1972年7月20日より工業高校前（現・田辺高校）～東と草内口～草内が国道307号の新道に路線載替を行った。