Expressway ramp up-down direction flow estimation method based on toll station data
A technology for highways and toll stations, which is applied in the field of traffic information, can solve problems such as difficulties in obtaining traffic flow at the entrance and exit of ramps, and affect the accuracy of flow forecasting on expressway sections, and achieve good prediction and estimation results
Active Publication Date: 2018-09-21
重庆大学溧阳智慧城市研究院
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Problems solved by technology
However, due to the limited deployment of vehicle detectors on expressways, many ramp entrances and exits are not equipped with vehicle detectors, which makes it difficult to obtain the traffic flow at the entrance and exit of ramps, which seriously affects the prediction accuracy of expressway traffic flow
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[0039] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0040] see Figure 1 to Figure 2 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arb...
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The invention discloses an expressway ramp up-down direction flow estimation method based on toll station data. The method includes the steps that 1, a vehicle model flow time sequence is established;2, an up direction entrance ramp flow time sequence is established; 3, training data which serves as least squares support vector machine regression is established; 4, appropriate parameters and a kernel function are selected, and the optimization problem of SVR is solved according to an least squares support vector machine regression algorithm; 5, a decision function is constructed; 6, a real-time small and medium-sized traffic flow and trailer traffic flow formula on the entrance of a toll station is substituted into the decision function to obtain a real-time flow estimation result of an up direction entrance ramp. By means of the method, the entrance ramp up-down direction traffic flow can be estimated in real time according to the similarity of the toll station traffic flow data in the time threshold and the law of the up-down direction traffic flow proportion.
Description
technical field [0001] The invention relates to the technical field of traffic information, in particular to a method for real-time estimation of uplink and downlink traffic on an expressway ramp. Background technique [0002] With the continuous strengthening of the national economic strength, the transportation industry is also developing rapidly, especially the expressway, which has developed rapidly in my country since the 1990s. As of March 2017, the total The mileage has exceeded 125,000 kilometers, and it is the country with the largest total mileage of expressways in the world. However, as the number of cars continues to increase and the economic interaction of various regions becomes more frequent, more and more vehicles are driving on the expressway, resulting in more and more serious traffic congestion on the expressway, and frequent traffic accidents . [0003] There are two main reasons for the increasing traffic congestion and frequent traffic accidents on exp...
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Login to View More IPC IPC(8): G08G1/01G06Q10/04G06Q50/26
CPCG06Q10/04G06Q50/26G08G1/0145
Inventor 孙棣华赵敏郑林江陈雪
Owner 重庆大学溧阳智慧城市研究院