## 3 Intelligent Control Strategies for Departure from the Parking Lot
### Inductive Control Strategy  
The timing control strategy comprehensively considers the vehicle departure demand of the parking lot and the traffic capacity of the associated intersections on the ground-level road. The traffic flow that enters the ground-level road is controlled by setting the fixed mediation rate of the intelligent lever lift system to avoid exceeding the capacity of the ground-level main road. The traffic capacity not only meets the basic departure demand of vehicles in the parking lot, but also ensures the efficiency of regional traffic. However, the demand for vehicle departure in the parking lot is quite different between peak and non-peak hours, as is the change in dynamic traffic on the ground in real time. The mediation rate given by the timing control strategy remains fixed for a period due to the non-real-time nature of the original data. This leads to the timing control strategy lacking the ability to adapt to real-time changes in external traffic (such as congestion and traffic accidents) and thus waste road resources. Therefore, this paper proposes an inductive control strategy based on a timing control strategy with the following principles:  
1. The inductive control strategy should obtain the real-time queue of the associated intersection on the ground-level road and the exit of the parking lot in real time through perception and communication technologies to provide data and decision-making support for the real-time speed control in the intelligent lever lift system at the parking lot exit. 2. The inductive control strategy should ensure that the vehicles in the parking lot are released under the majority of general circumstances and do not form long queues too inside the parking lot. 3. The inductive control strategy should avoid the vehicles being released from the exit of the parking lot seriously affecting the operation of the ground-level road. 4. The inductive control strategy should maximize the overall operating efficiency of the downstream intersections and the entrances and exits of the parking lot associated with the ground-level road. 5. The inductive control strategy is applied with information induction methods. When a long queue is formed at the exit of the parking lot, the guidance information is released in advance to guide vehicles to choose other exits for a rapid departure and avoid aggravating congestion of the regional area or a queue forming in the parking lot. Based on the above principles, the inductive control scheme of the intelligent lever lift system at the exit of the parking lot is designed as follows. As shown in Figure 3, intelligent sensors (e.g., coils, AI cameras) are provided downstream of the exit lane of the parking lot to detect the length of the downstream queue. The intelligent lever lift system at the exit of the parking lot is always in the release state, shown as a green light in Figure 3. When the length of the queue downstream of the main road exceeds the threshold, the intelligent lever lift system at the exit of the parking lot turns red, indicating that the exit is not releasing vehicles. The management platform judges the duration time of the red light and the queue length downstream of the main road in real time. If the queue length downstream of the main road is less than the maximum duration time of the red light, the green light is restored. If the duration time of the red light is larger than the maximum duration time, the intelligent lever lift system at the exit of the parking lot returns to a green light. If it is less than the maximum duration time and the queue length downstream of the main road still exceeds the threshold, the intelligent lever lift system at the exit of the parking lot shows a red light. The threshold of the queue length for the downstream main road is determined based on the distance between the position of the actual road entrance and exit and the stop line of the downstream-associated intersection.