Freeway Alinement Research Based On Driver's Psychological And Physiological Reaction

The theory of traditional road alignment design based on vehicle driving theory is challenged increasely. Here is a question: why many kinds of road through excelsior and strict design, especially for freeway, after several years's run, appear a series of segment of a highway where accidents are facile to happen.The research attempts to newly scrutinize some parts of freeway alignment from a different point of view in expectation of making a contribution to traffic safety and traval comfort. Under the guide of above ideas, in order to find out the inherent relation and law between hignway alignment and driving physical request, the theory and the instrument on medicine , psychology and physiology are applied to the research, at the same time ,lots of driving experiment are done Because human's mental and physical variation is instant, and dynamic, the physical signal during driving become complex and fluctuant. In order to get the physical signal relating to road alignment, the technology of signal processing, that is the theory of spectrum analysis, is introduce into the research to study the signal of driver during driving, for example, from driver's the figure of heart rate and power, we can obtain the frenquency range in which the heart rate is extraordinarily affected by road alignment, consequently, can quantificationally determine the effect that all kinds of road alignment have on driver.By regression analysis and many driving tests, we attempt to get the relationship and the modal between mental and physical variation and road horizontal and vertical alignment and its combination, and according to the modal, discauss the road alignment meets driver's mental request.The horizontal alignment is the main alignment in highway, so the paper give emphasis to mentality characteristic when driver is travelling at the horizontal curve the research discover that response of drive's mentality is to very sharp, when the radius of curve reduce to a fixed value .at the approach of easement curve followed by small circular curve, majorities of riders obviously decelerate .as a vehicle travel along the curve , compelled deceleration means certain danger the degree of the tension in drive is accord to the deceleration range. having a long straight line between two small radius curves is adverse to riding and comfort, because too long straight line result in rider unconscious accelerationaccerat, in addition, too small radius curve lead rider to decelerate reluctantly. From the safety and comfort of drivers, the dissertation analyzes and calculates how much the curve is after long straight line quantificationally. From continuum of the speed and the placidity ofpsychology reponse, too long straight line is not appropriate between two small compound Curves or Reversing Curves.But from the characteristic of the vision and the convenience of operating cars, the straight line is not also too small.Therefore the two aspects must be considered when straight line is chosen between compound Curveor Reversing Curves, especially compound CurvesWhen traveling on straight segments with different slope, regardless of down slope or up slope, driver is slightly affected. However, the tenseness of driver is mainly correlative to speed. When traveling on curve segment with down slope, driver is greatly affected. The more the slope is large, and the more the radius is small, the more the degree is acute. The phenomenon of mental reaction is accordant with common sense.In the end, athe paper quantificationally established some index of freeway alighment that meet the mental and physical request of driver with the modals in the paper...