Calculation method and apparatus for free flow speed
A calculation method, a technique for flow velocity
Active Publication Date: 2016-03-23
ZHEJIANG UNIVIEW TECH CO LTD
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[0004] In urban roads, the road section will be affected by various factors such as traffic control, traffic lights, pedestrians, etc., so the free running speed of the vehicle will not reach the upper speed limit of the road section, that is, the free flow speed of the road section cannot reach the speed limit upper limit of the road section
Obviously, if the upper speed limit of the road section is directly used as the free-flow speed, the selection of the free-flow speed will be inaccurate, and then the calculated TPI will not match the actual road conditions.
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[0028] The terminology used in this application is for the purpose of describing specific embodiments only, not to limit the application. As used in this application and the claims, the singular forms "a", "the" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
[0029] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present application, first information may also be called second information, and similarly, second information may also be called first information. Dependin...
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The invention provides a calculation method and apparatus for a free flow speed. The method comprises: for each of N continuous first time periods, first historical data collected by first front-end equipment at the first time periods and second historical data collected by second front-end equipment at the first time periods are obtained, first average speeds of each vehicle passing through a monitoring road section within the first time periods are determined by using the first historical data and the second historical data; a first average speed in a specific speed zone is screened out of the first average speeds of each vehicle and second average speeds of the first time periods are calculated by using the first average speeds in the specific speed zones; with the second average speeds corresponding to the N first time periods, third average speeds corresponding to second time periods are calculated; and then a free flow speed is calculated by using the third average speeds corresponding to second time periods. According to the technical scheme, a reasonable free flow speed can be calculated, so that the calculated TPI matches the actual road condition well.
Description
technical field [0001] The invention relates to the technical field of monitoring, in particular to a method and device for calculating free flow velocity. Background technique [0002] As the number of cars increases, it puts more and more pressure on urban roads, and road congestion is increasing. In order to better guide the driving of vehicles, reduce road pressure, improve road smoothness, and reduce the time spent by drivers, TPI (TrafficPerformanceIndex, road traffic operation index) is usually used to comprehensively reflect the traffic congestion of the road network. The value of TPI is 0-10, 0-2 means that the road network is in a smooth state, 3-4 means that the road network is basically in a smooth state, 5-6 means that the road network is in a mildly congested state, 7-8 means that the road network is in a moderately congested state, 9 -10 indicates that the road network is in a state of severe congestion. [0003] At present, TPI is determined by the average ...
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IPC IPC(8): G08G1/052
CPCG08G1/052
Inventor 何伟魏
Owner ZHEJIANG UNIVIEW TECH CO LTD