The Dripping Hitchhiker system detects whether the actual vehicle used is the same as the vehicle that takes the order in a number of ways, and the following are possible ways:

Vehicle License Plate Number Recognition

The Dripping system records the license plate number that the driver submits when he or she registers for the service. When a driver takes an order and uses a vehicle to perform the service, the system may try to confirm whether the license plate number of the vehicle is the same as the one at the time of registration by some means (e.g., real-time location on the passenger side, image recognition, etc.).

Model Identification

The system will also record the vehicle's model, color, and other characteristics. If there are significant differences between the actual vehicle used and the model and color in the registration information, the system may also be able to detect them through feedback from the passenger side or through automatic identification technology.

Trajectory Analysis

The system monitors and analyzes the driving trajectories of drivers and passengers in real time. This may also trigger the system's warning mechanism if the vehicle's trajectory does not match the expected one after the driver takes the order, or if there is abnormal driving behavior.

Passenger feedback

Although you mentioned that it's not a passenger complaint, passenger feedback is still an important basis for system detection. If a passenger notices that the actual vehicle used does not match the vehicle that took the order, they have the option to provide feedback to the platform, which will be brought to the attention of the system.

Other technical means

Drop may also use other advanced technical means, such as big data analysis and machine learning, to comprehensively determine whether the vehicles are consistent.

As for your case, even though you have informed the passenger in advance that the vehicle has been changed, the DDT ride-hailing system may still have detected the vehicle discrepancy by the above means and triggered the warning mechanism. It is recommended that you try to communicate with the platform's customer service to find out whether you can suspend taking orders or cancel orders when you encounter problems with the vehicle, in order to avoid unnecessary trouble. At the same time, make sure you always comply with the platform's rules and policies to ensure your service quality and passenger satisfaction.