67results about How to "Practical engineering application value" patented technology

The invention discloses a plane intersection design variable weight comprehensive evaluation method based on a rank sum ratio method. The plane intersection design variable weight comprehensive evaluation method comprises constructing an original data list, editing ranks, applying weights to different evaluation indexes, computing weighting rank sum ratios (RSRs), determining the distribution of the RSRs, computing a regression equation, classifying and sequencing files and other steps. According to the plane intersection design variable weight comprehensive evaluation method, on the basis of designing relevant evaluation indexes for urban road plane intersections under the condition of mixed traffic, variable weight factors and the rank sum ratio method are combined and used for comprehensive evaluation and sequencing of the running conditions of the multiple plane intersections. Besides, an efficiency index and a safety index are combined so that the defect of a traditional single evaluation method with efficiency as priority or safety as priority can be overcome, and meanwhile, the situation that a weight coefficient changes along with the change of an index value is considered so that the defect that a constant weight coefficient is used for the evaluation of multiple targets traditionally is overcome. The plane intersection design variable weight comprehensive evaluation method based on the rank sum ratio method has actual engineering application value in the aspects of judging the running conditions of the intersections and analyzing traffic system crucial reasons.

The invention discloses a prediction method of an urban road signalized intersection direct-left conflict number. A plurality of direct-left conflicts and conflict flow of the direct-left conflicts and geometric characteristics of an intersection serve as data base, and an urban road signalized intersection direct-left conflict prediction model is built by aiming at four different traffic operation conditions and utilizing a mechanism generated when a generalized linear model excavates the traffic conflicts. Direct-left conflict frequency in unit time interval is obtained by substituting traffic flow parameters into the model so as to provide evidence for intersection indirect safety evaluation. According to the urban road signalized intersection direct-left conflict number obtaining method based on the direct-left conflict prediction model, traffic conflicts can be predicted by traffic flow which is easy to be collected, the defect and disadvantage that conflict collecting cost is high in present traffic conflict technology are overcome, and the prediction method is more accurate and scientific compared with manual observation conflicts of the prior art and capable of promoting the traffic conflict technology to be applied in engineers.

The invention relates to a discriminant analysis-based high road real-time traffic accident risk forecasting method. The method comprises the following steps of: building a high road accident risk discrimination model for a detection area; substituting real-time traffic flow characteristic parameters into the high road accident risk discrimination model; and judging whether the risk of traffic accident exists or not. According to the method, traffic accidents can be forecasted in real time by using the real-time traffic flow characteristic parameters acquired by high road traffic detection equipment, the method has relatively high forecasting precision, and technical defects and shortages in the prior art for analyzing traffic safety by using aggregated statistics are overcome. The method has practical engineering application value in the aspects of discrimination of the risk of the high road traffic accidents and forecast of the traffic accidents.

The invention relates to a variable speed-limit control method of expressway based on real-time traffic flow and weather information, which can automatically regulate the speed limit values under various traffic flows and weather conditions according to real-time change of the traffic flows and the weather states, and send the speed limit message to a driver by a variable message board, so as to reduce traffic accident risk. The invention is featured by making use of a traffic flow detection device and a weather environment detection device to obtain real-time traffic flow and weather parameters, automatically regulating the speed limit according to various traffic flows and weather states to overcome the defect and shortcoming that the prior road speed limit can only be fixed and unchanged. Therefore, a dynamic speed limit method according to the real-time traffic flow and weather information has an actual engineering application value in the expressway traffic management and control aspect.