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Due to the road and traffic conditions, traffic management and control and interference of driver cannot control facilities caused by factors of the travel time in seconds/car loss, or minutes/bus.
The overseas research history and status quo
In the early 1950's, some overseas scholars began to this question. Research from simple to complex is according to the law. They from the simplest single destination network capacity up, the paper analyzes the concept of network capacity, in each network has a capacity of arc limit conditions, from a special point to another special end in not more than any arc capacity, under the premise of maximum can assign traffic -- network capacity. But it is obvious that the practical road traffic flow may not start from the same to the same destination termination, so the traffic engineers cannot accept the single point on the concept of network capacity calculation results. Subsequently, traffic engineers in facing the problem of the network topology results from the starting point, tries to be the actual network number by some means to end up the abstraction of the network structure, so as to establish a more simple method for determining the destination network capacity. Subsequently, the actual traffic engineers found not only end of road network, and not only can easily handle a single point on the network, and the choice of each together is random, making them realize must use to solve nonlinear, random open, more complex system of the methods to deal with this problem.
In this process, the traffic engineers in different period, puts forward different analysis methods. First, in 1952, Beckmann in his essays in continuous mentioned in the transportation systems to network; the representation of Secondly the 1956, Princeton university professor Ford's most famous operations L.R.J r and Fulkerson D.R.} in graph theory, based on the transport network, network, and network with such kind of general significance capacity problems, puts forward the network flow model, and are presented in 1962, the maximum flow network - a label first algorithm method, people pay more and more attention to study mathematics network theory and transport system and put forward many mathematics model of road network capacity calculation and simulation method, That same year, Japan's letter from my village and miyoshi two also began to study, and two network in the civil society published about network maximum capacity: next, Buchanan (1963) and Smeed (1966) in a London's research in physics and solve the network environment of the relationship between the capacity of [1-2] about network capacity, the study also is superficial. But in the 1970s, the study made rapid progress. In 1972, Iida first proposed based on a simple network technology of distribution of growth of heuristic algorithm capacity. This method according to the latest arc flow rate of the arc, take a drive time suitable proportions, will O - D matrix and distribution to road, when a road to its capacity, distribution, through calculation saturated arc termination of cut set to determine the sum of network capacity, Meanwhile, Japan's Kyoto university professor -- rice fields called Mr Respectful published road network capacity evaluation method of traffic flow distribution, proposed by the method of calculating network capacity, Then in 1973, Ruiter and Safermos respectively and discrete network model. Due to this kind of model is mainly used to analyze those relatively simple, finish and road network, have specific provision is not suitable for analysis and end up higher density of urban road network. So StellaC D.a. Fermos in 1977, puts forward the continuous transportation network model, this model assumes traffic flow in the transportation network is the premise for distribution, ensure user equilibrium of conservation and flow of a set of new models. Then, Spain for the problem of engineer, so interested in 1982 in August in France at the Stella hold the 14th international transportation engineering and security research A.S.R engineers in midweek, Spain odriguly based on network analysis theory, from the Angle of road network capacity planning study, but it is the study found no superficial way to solve the problem, then in 1989, Masuya Saito, and from the physical structure of network itself (i.e., consider only the roads and road network capacity is restricted to limit conditions), supply and distribution hypothesis of sufficient conditions, using the theory of the flow chart of minimum cut theorem and linear programming method to determine the capacity of the network.
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