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Highway geometric design method adopting speed of service forecast model

A technology of running speed and prediction model, applied in the direction of roads, roads, buildings, etc., can solve the problems of inconsistent driving speed standards, incompatible linear design elements, etc., and achieve the goal of improving design quality, reasonable and objective and balanced design, and increasing project cost. Effect

Active Publication Date: 2008-01-23
TIANJIN MUNICIPAL ENG DESIGN & RES INST
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Problems solved by technology

To sum up, the shortcomings of adopting the "design speed" method are mainly manifested in three aspects: (1) the incompatibility between the linear design elements and the actual driving speed; (2) the incompatibility between the linear design elements; (3) the incompatibility of the linear design elements Inconsistent driving speed standards

Method used

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  • Highway geometric design method adopting speed of service forecast model
  • Highway geometric design method adopting speed of service forecast model
  • Highway geometric design method adopting speed of service forecast model

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Embodiment Construction

[0052]The operating speed is the actual speed of the car on the road. In fact, the speed of the car when driving on the road section is different, and the speed of the same car is also different when different drivers drive the same car. The condition of the road and the speed of the vehicle are different, and the running speed of the truck and the passenger car is also different. Evidence shows that the free speed of drivers on a road segment is usually distributed with a coefficient of variation of about 0.14. Within the upper percentage limit, the vehicle speed increases evenly with frequency accumulation until the latter reaches around 85%. From that point onwards, the upward trend must continue more rapidly. This means that 15% of the observed speed is surprisingly high. The purpose of highway design is to create conditions to meet the speed requirements of almost all drivers, but not all drivers, because if the design also considers the drivers who specialize in high-...

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Abstract

A linear design method for express way using a run-speed predicating model is provided, which sets up a run-speed predicating model by multiple linear regression analysis method, carries out linear design by taking the run-speed predicating model as the design parameters. The method comprises the following procedures: selecting the designed speed, determining preliminarily the indexes for the horizontal and longitudinal faces in conjunction with the landform conditions; checking and modifying the preliminarily determined route according to standard linear design; predicating the run speed; checking and modifying the preliminarily determined route according to the run speed; determining the technical indexes for the route. Comparing with prior technology, the invention efficiently guarantees the reasonable matching between the linear factors for express ways, such as plane and curve radius, longitudinal slope, upright curve radius, etc. with the designed speed, gets a balanced design that is continuous, consistent, reasonable and objective, and will not increase the project cost due to too high requirement from the indexes, and increase the quality of the linear design for express ways.

Description

technical field [0001] The invention relates to a highway design method in the transportation industry, in particular to a method for designing highway alignments using a running speed model. Background technique [0002] Expressway is a three-dimensional strip-shaped linear structure, and the linear shape is the skeleton of the expressway and the direct carrier of vehicle operation. Expressway alignment is a collection of plane alignment, longitudinal section alignment and cross section. Once the highway alignment is determined, no matter whether it is good or bad, it is difficult to change it, which is why designers must pay special attention to the quality of alignment design. [0003] Driving speed is the most critical parameter to determine the geometrical shape of highway design. As the basic index and parameter of linear design, once the "travel speed" is selected, all relevant elements of the road, such as the radius of the horizontal curve, the length of the trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C1/00
Inventor 熊文胜王晓华靳灿章李海舢李传宪肖田汪凌志王玉秀王蕊徐青郑利严西华曹凌峰
Owner TIANJIN MUNICIPAL ENG DESIGN & RES INST
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