Vehicle flips onto the pavement.

If a vehicle flips onto the pavement then what will happen?

The answer is "the car will be destroyed" like this ↓

Installing necessary pilings at the entrance of a crosswalk or a pedestrian lane can not only prevent vehicles from entering, but also protect the safety of pedestrians under special circumstances, such as a vehicle out of control and breaking into the sidewalk causing an accident.
In China, vehicles and pedestrians are perfectly separated, and guardrails and other devices are installed beside the road to protect the safety of pedestrians.

So the bollard is very important to pedestrian，maybe driver drives the wrong way,but it will cause unnecessary losses and casualties,bollard may be a good choice to avoid this bad situation.