1. The shelf system of the four-way bus is very flexible, which can change lanes at will and stay at any position, and the system capacity can be adjusted conveniently by increasing or decreasing the number of buses.

2. The four-way shuttle system "unbinds" the roadway and the hoist by flexibly adjusting the working roadway of the shuttle car, which solves the bottleneck problem of the multi-layer shuttle car to the hoist, can completely configure the equipment according to the workflow, reduce the waste of equipment capacity, and make the cooperation between the shuttle car and the hoist more flexible.

3. The four-way shuttle system is modular and standardized, all cars can be replaced with each other, and any car can continue to perform the task of the problematic car. In the traditional multi-layer shuttle bus system, if the elevator breaks down, the whole roadway operation will be affected, but the four-way shuttle bus system will not be affected.

4. From the overall cost of the system, because the cost of the common multi-layer shuttle bus is closely related to the number of lanes, each lane in these systems will increase the corresponding cost without increasing the order quantity and inventory, while the four-way shuttle bus system only needs to increase the number of buses, so the overall cost is lower.

5. Compared with the traditional multi-layer shuttle shelf system, the four-way shuttle shelf system has more advantages in safety and stability. It is suitable for low-flow and high-density storage and sorting, and can better meet the needs of customers.