Mass Rapid Transit Authority of Thailand (MRTA), by Safety Occupational Health and Environment Office executed safety audit for the MRT Purple Line Project: Tao Pun – Rat Burana (Kanchanapisek Road) Section, including day audit at construction sites of cut and cover tunnel, Bang Khun Phrom Station, Wongwian Yai Station, Bang Pakok Station, and Rat Burana Station, and night audit at construction sites of Vajira Hospital Station and National Library Station for inspecting fence tarp, lighting, warning light, material and equipment fixing, and installation of road diversion and warning signs along the route to ensure that they are neat, stable, locate on safe position, and visible, for road user safety and preventing road accident at night. Besides, MRTA assigned the civil works contractors to monitor and to adhere to flood prevention measures in their construction site areas to provide convenience and safety to the people during the rainy season, in order to carry out the construction of the Purple Line Project smoothly, in according to MRTA Safety Declaration: Zero Fatal Accident, preventing damage for workers and road users.