How to treat the long-term occupation of free parking spaces on both sides of the road?

Free parking spaces on the roadside always pay attention to first come, then come, and in the absence of regulations, how long people stop is their business. We can morally condemn them, but in terms of rules, there is really nothing we can do. Shameless people will really take advantage of it, mainly depending on the influence. For example, there are always some abnormal cells in people, and even ordinary people will not. Long-term possession is certainly unreasonable.