1. Aviation obstacle lights and signs shall be installed in buildings and structures with height limit or ultra-high height protected by airport headroom.
2. Artificial and natural obstacles affecting flight safety on the air route and around the flight area shall be equipped with aviation obstacle lights and signs.
3. For high-rise buildings and facilities on the ground that may affect flight safety, aviation obstacle lights and signs shall be installed and maintained in normal condition.
Departments of public security, fire control and traffic have built helipad in the city, and the sky above the city is regarded as clear air. The tall buildings and structures in the city should be equipped with aviation obstacle lights and signs.