The urban motor vehicle population is growing rapidly, and the contradiction between traffic supply and demand is becoming increasingly prominent .

The traffic attraction in the core area of the main city is strong, and the main roads are in supersaturated operation.

The carrying capacity of the construction section decreases, and traffic congestion spreads to the surrounding roads .

The degree of traffic management informatization is low, there are many isolated island systems, and the data are not interconnected and intercommunicated for full utilization, resulting in relatively low operational efficiency in traffic management .

It is impossible to obtain road section information in real time but rely on passive video surveillance instead, which results in untimely accident discovery and disposal, thus impossible to quickly solve congestion.

Without an online collaboration mechanism, it is impossible to form a "all-in-one network" for urban traffic control, which leads to the relatively low efficiency in event disposal and resource scheduling .