Legal analysis: the 15% discount on rural commercial etc is not permanent, but an activity for a period of time. The specific time limit depends on the bank's regulations.

Legal basis: Article 58 of People's Republic of China (PRC) Highway Law allows the establishment of toll roads according to law, and at the same time controls the number of toll roads. It is forbidden to collect vehicle tolls on any highway except the highway that can collect vehicle tolls as stipulated in Article 59 of this Law.