Linearies Apprising Of Freeway-Choosing Apprising Index And Theory Analysis

Freeway linearies apprising is most important for freeway planning and construction. It can beforehand estimate advantage and shortcoming of linearies, also can find its infection to improve through linearies apprising in designing phase. So this can eliminate bad linearies at beginning of a project, attribute to enhance comprehensive benefit of freeway in its operation phase. Moreover linearies apprising can optimize the total cost of a project in designing phase, so that integrate safety, economic, comfort of route into a body in using phase of linearies.Current the researchs for freeway linearies apprising specially apprising from quantity are scare, most apprising methods only are from theory o The research of this thesis is exploring, the author attempts to estimate freeway linearies from quantity, and brings forward some apprising indexes from quantity 0The most character of freeway is high speed, When speed is higher, the eyes of driver more access moving vision trait. So linearies become the most object that drivers observe, linearies apprising also becomes more important and necessary. Linearies are the framework of freeways, freeway linearies apprising should seize time factor to embody high speed.This thesis chooses apprising index mostly from speed, vision, traffic safety and macro statistic angel, and analyzes these indexes from theory. Speed and vision can directly reflect the condition of linearies, so apprising from these two aspect is more practical value. And speed always serves as key parameter of linearies apprising, and it is adopted by some estimate methods. This thesis on the spot observes car speed on freeway in Tianjin zone, and analyzes these data from statistics. The analysis finds that freeway linearies already can not affect sensitively car speed, thus speed serving as key parameter of linearies apprising only can be applied to certain scope. The author thinks freeway linearies apprising should pay more attention to vision effect of solid linearies, so linearies apprising can access to practical apperceive of drivers when driving.The thesis considers human factor and applies the theory of environment and psychology to linearies apprising, in order to make apprising index embody the need of engineering technology and the need of road user. So freeway linearies is optimum in economy and also can satisfy the need of driving safety, comfort and economical...