[0047] All features disclosed in this specification, or all disclosed methods or steps in the process, except for mutually exclusive features and/or steps, can be combined in any manner.
[0048] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless specifically stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is just one example of a series of equivalent or similar features.
[0049] The specific implementation of the present invention will be described in detail below in conjunction with the drawings and embodiments.
[0050] In the following detailed description, many specific descriptions are described for the purpose of explanation to enable a thorough understanding of the disclosed embodiments. However, it is obvious that one or more embodiments can be implemented without using these specific descriptions. In other examples, known structures and devices are schematically shown in order to simplify the drawings.
[0051] Such as figure 1 As shown, according to an embodiment of the present invention, the calculation method based on the urban road congestion index disclosed in this embodiment uses high-definition video collection data, bayonet passing data, road network GIS data, road basic data, extreme weather, traffic Control information and other basic traffic data, carry out traffic data fusion and traffic congestion index calculation and statistical analysis, identify congested road sections and intersections, and evaluate traffic congestion index based on congestion intensity, range, time, etc., to achieve a hierarchical road network Traffic congestion index evaluation and analysis, to realize information statistics, query, analysis, release management and other functions.
[0052] The method of this embodiment includes:
[0053] 1. Definition and division of road sections: There are two methods for road section division. The first method: divide according to the length, the length is about 500 meters as a section. The second method: According to equipment installation points, the equipment and equipment are defined as a road section.
[0054] 2. Definition of average speed: take passenger cars (private cars, taxis) as the unit, count as P1, equate passenger vehicles as N cars, count as P2, and equate freight vehicles as M cars, count as P3 , Non-motor vehicles are equivalent to L passenger cars, counted as P4, and the unit is 5-10 minutes as the collection period, and the average speed is calculated by weighting the average.
[0055] 3. Average driving speed of road network: calculate the average driving speed of each road in the road network separately; calculate the speed of each level of road network separately, and weight the average travel speed of each road according to the flow rate and road mileage ratio as a weight Average speed of road network.
[0056] 4. Data filtering and cleaning: There will be a lot of unreasonable data in the vehicle traffic data. In the data cleaning stage, the basic information of the road network will be combined to integrate the basic traffic information in a reasonable and standardized manner, and provide basic data for congestion analysis material.
[0057] Filter road paralysis caused by traffic emergencies (car accidents) in road sections. Filter the repeated data and redundant data of the passing vehicle records in the road section, and enter the calculation flow after the cleaning is completed.
[0058] 5. Data calculation: divide the road section into 5 levels of congestion perception. Calculate the mileage ratio of the road section of the unobstructed operation level, and calculate the mileage ratio of the road section of the severely congested operation level; use the parameters of flow, road distance, number of lanes, road design speed, extreme weather, and traffic control as weights to calculate the road congestion of each level The mileage ratio is weighted to calculate the congestion index of the road network.
[0059] Specifically, the calculation method based on the urban road congestion index in this embodiment includes the following steps:
[0060] The first step: Calculate the arithmetic average value of the road section speed. The arithmetic average of all vehicles passing the j-th section of road within 5 minutes:
[0061]
[0062] Represents the arithmetic mean value of speed in section j, N j Represents the number of passing vehicles on the j-th section, V j1 , V j2 , V jN Represents the speed of the first vehicle, the second vehicle, and the Nth vehicle on the j-th section.
[0063] Step 2: Calculate the standard deviation of the road section speed:
[0064]
[0065] Represents the standard deviation of the j-th road section and the i-th car. The meaning of other letters is the same as the previous step.
[0066] Step 3: Calculate the average speed of the road section:
[0067]
[0068] Represents the average speed of section j, S j Represents the length of the j-th section.
[0069] Step 4: Calculate the flow factor of the road section.
[0070] The flow factor depends on the historical year-on-year cycle traffic flow value in the past three years, holidays and holidays, and the geographical distribution of important places such as schools, business districts, and hospitals. The specific parameters are shown in the table below.
[0071] Flow factor table
[0072]
[0073]
[0074] Step 5: Calculate the lane number factor of the road segment.
[0075] The lane number factor depends on the number of lanes in the same direction and road performance. The specific parameters are shown in the table below.
[0076] Lane number factor table
[0077]
[0078] Step 6: Calculate the extreme weather factors of the road section.
[0079] The extreme weather factor depends on the weather event alert level of various types of weather. The specific parameters are shown in the table below.
[0080] Extreme weather factor table
[0081]
[0082]
[0083] Step 7: Calculate the traffic control factor of the road section.
[0084] According to the control standards implemented by road traffic control, including speed limit, limit, reserve emergency lane, turn on warning lights and sign lights, confirm the traffic control level, and determine the range of traffic control factors. The specific parameters are shown in the table below.
[0085] Traffic control factor table
[0086] Control level
[0087] Step 8: Calculate the congestion index (RCI j ):
[0088]
[0089] RCI j Represents the congestion index of section j, V jmax Represents the road design speed per hour of section j, F js Represents the actual passing flow of section j, F jmax Represents the maximum design throughput of the road in section j, V jfac Represents the influencing factor of extreme weather, number of lanes, and traffic control on the speed of section j, F jfac Represents the influencing factor of extreme weather, number of lanes, and traffic control on the speed of section j, L jfac Represents the influence factor of the number of lanes on the speed of the j-th section, W jfac Represents the influencing factor of extreme weather on the speed of section j, C jfac Represents the influence factor of traffic control on the speed of section j.
[0090] Step 9: Calculate the congestion index (RCI) of the area:
[0091]
[0092] T I Represents the comprehensive weighting factor of each road section.
[0093] Step 10: Divide the congestion index.
[0094] Establish a road traffic operation evaluation index system and real-time monitoring platform, release road traffic congestion indexes and related evaluation indexes in real time, provide road traffic information services for road traffic travelers, and provide decision-making basis for road traffic managers. See the following table for specific parameters.
[0095] Evaluation index table
[0096]
[0097] The "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification mean that the specific features, structures or characteristics described in combination with the embodiment are included in the general description of this application In at least one embodiment. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when describing a specific feature, structure, or characteristic in combination with any one embodiment, it is claimed that combining other embodiments to realize such a feature, structure, or characteristic also falls within the scope of the present invention.
[0098] Although the present invention has been described with reference to a number of explanatory embodiments of the invention, it should be understood that those skilled in the art can design many other modifications and embodiments, and these modifications and embodiments will fall within the principles disclosed in this application. Within the scope and spirit. More specifically, within the scope of the claims disclosed in the present application, various modifications and improvements can be made to the component parts and/or the layout of the theme combination layout. In addition to the modification and improvement of the component parts and/or the layout, other uses will also be obvious to those skilled in the art.
