Question 1: The index system for evaluating the impact of community opening on vehicle traffic should generally include the following three types of indicators: efficiency, safety and robustness. How to choose the evaluation index reasonably and how to measure the index value are the key points of this problem. Evaluation index can be defined in many ways, and its value can be judged according to its rationality and computability.

The second problem requires the establishment of a traffic flow model to study the impact of community opening on surrounding roads. The key factors to be considered are traffic flow and flow distribution, vehicle driving rules, community opening rules and so on. What needs special attention is the special influence factors of community opening on road traffic. For example, there is generally no traffic signal at the intersection formed by residential roads and main roads, and the speed of main roads and roads inside the residential area is different, so vehicles entering and leaving the residential area. A traffic model without considering this special influence is of little value to this problem.

Question 3: According to the different effects of the opening of residential areas on the surrounding road traffic, residential areas should be discussed in different types. The main classification factors are the size of the community, the density of residents, and the number of intersections entering and leaving the community. In addition, the traffic distribution of the surrounding roads will also affect the opening effect of the community. When judging, we should pay attention to whether this problem is calculated according to the model established by the second question and whether the effect is evaluated according to the index system of the first question.

The fourth question mainly investigates: 1. Whether the rationalization proposal of the paper comes from the model calculation results; 2. Whether the rationalization proposal is substantive.