This sentence comes from the signboard: the bright moon is in the sky, and now the road is clear, so there is no need to step on the stairs to cool down.
Guanghan generally refers to Guanghan Palace, and Guanghan Palace also refers to the moon. In ancient times, the moon was usually used to represent Imperial High School.
Understand these two, you can say the meaning of this sign. Now that you have reached the road of Qingyun, you don't have to step on the ladder to catch cold. Now that you have the road to success, you don't need to pass the imperial examination to achieve the road to success. Morally, there should be a turning point now, or we are thinking about a good development. It should be signed.