Who is at fault when the car in front suddenly stops and a rear-end collision occurs?

[JasperLynn]

Responsibility lies with the following vehicle, as the rear-end collision was caused by the following vehicle failing to maintain a safe distance for emergency braking measures, making the tailing vehicle fully liable. Here is additional information: 1. Road Safety Law: Article 80 of the Road Safety Law stipulates that when a motor vehicle is driving on a highway at a speed exceeding 100 kilometers per hour, it should maintain a distance of more than 100 meters from the vehicle in front in the same lane. When the speed is below 100 kilometers per hour, the distance from the vehicle in front in the same lane can be appropriately reduced, but the minimum distance should not be less than 50 meters. 2. Alerting the following vehicle. An important driving technique to effectively prevent rear-end collisions is to alert the following vehicle: First, frequently check the following vehicle. If it seems too close, lightly tap the brakes to alert it. Second, if the traffic ahead is dense and moving slowly, turn on the hazard lights to remind the following vehicle to slow down.