The on-site signal operation permit is a special operation permit and needs to be reviewed 60 days in advance. However, those who have training generally require to register and review three months in advance and go to the local Municipal Construction Committee or the Technical Supervision Bureau for review.

The main job of on-site signal lamp is to cooperate with tower crane operators, which belongs to a special type of work. Moreover, when working in a blind area, the conductor's command is extremely important, and the conductor's baton is the eyes of the tower crane driver.