The future development trends of elevators include: 1. Intelligence: With the development of artificial intelligence technology, elevators will become increasingly intelligent. Future elevators will have more intelligent control systems that can automatically identify passengers' needs and provide more personalized services. 

2. Energy saving: In the future, elevators will increasingly focus on energy conservation and environmental protection. The elevator will adopt more energy-efficient motors and drive systems to reduce energy consumption and carbon emissions. 

3. Safety: Future elevators will place greater emphasis on safety. The elevator will adopt more advanced safety technologies, such as infrared sensors, cameras, etc., to improve the safety and reliability of the elevator. 

4. High speed: Elevators in the future will become increasingly fast. The elevator will adopt more advanced driving technology to improve its operating speed and efficiency. 

5. Multifunctionality: Future elevators will have more diverse functions. Elevators will not only be vertical transportation equipment, but also have more diverse functions such as meeting rooms, lounges, etc. 

In short, future elevators will become increasingly intelligent, energy-efficient, safe, high-speed, and multifunctional. These development trends will provide people with more convenient, safe, and comfortable vertical transportation services.