【正文】 s evacuating safely and staff members and equipment security. When the train blocks the trouble, can maintain passenger39。t give full play to the highspeed advantage that transport safely . Practice indicates , the semirigid guardrail is a kind of guardrail form with very good performance , already used widely worldwide, because new mechanism semirigid to protect design of fence new technology can make semirigid highspeed collision safe performance of guardrail improve further on the basis of semirigid guardrail anticollision, exceed to vehicle outlet prevention and cure of the traffic accident (accident this kind of the main reason that cause special , great malignant traffic accident ) have important meanings, therefore have wide application prospects . Study on new mechanism of the anticollision of semirigid guardrail to guarantee highway munication transportation system realize at a high speed transporting basic research of purpose one of safely, it is a subject for research of crossing in fields multidisciplinarily, the value of academic research with importance and prospect of using. It break through professional restriction that divide in the past, collide the system as a big system of coupling automobile semirigid guardrail, proceed from the angle of guaranteeing the safe level is optimum that the passenger collides in the car , study and collide the ideal sport law which the automobile should possess in the course, On this basis, through set up automobile semirigid guardrail collide systematic coupling dynamics artificial model is it study guardrail anticollision new mechanism to e, improve the precondition of designing petence of semirigid guardrail to the great breakthrough of the designing technique of traditional guardrail , have important meanings to the prevention and cure of the special , great malignant accident in the traffic accident of the road, so, should launch the study on it , the improvement of petence in order to guarantee road traffic39。s own great phenomena out of shape of ball plasticity of automobile in the model, and also consider the semirigid guardrail and automobile one39。s own the automobile and semirigid guardrail and contact and friction each other even more. In a word , have not considered any coupling dynamics phenomenon . Obviously, the essence that the designing technique of semirigid guardrail received like this can not reflect the question , result its unfavorable to special, great malignant traffic accident prevent and cure improvement of petence. We think , two inalienable ponents in the system that the automobile and semirigid guardrail collide in the automobile bumps into this incident of semirigid guardrail , the mutual coupling of two , influencing each other , form an organic whole together. While the automobile bumps into the semirigid guardrail , the automobile will keep in touch with the semirigid guardrails , and position and area of contact that are exposed to will change with sport of the automobile , the contact area changed will produce the contact strength and frictional force changed changed , under acting on monly in contact strength and frictional force changed of changing, semirigid guardrail and automobile car body structure will take place size and whom position change heavy and out of shape (this kind is big and out of shape and often closely related to the emergency rate effect of the material and inertia effect), This kind heavy to can cause new contact while being out of shape (including automobile car body structure and semirigid guardrail are one39。 3)While colliding , the damage to the passenger is the minimum degree: 4)Can lead the sight of the persons who drive . Can be found out from abovementioned functions, the guardrail must have suitable intensity of mechanics and collision in order to keep out the vehicle of rigidity , prevent the vehicle from crossing outside of outlet (the bridge ): Meanwhile, rigidity of guardrail can too heavy, can is it injure or lighten the degree of injuring to protect passenger from better. Real car full size is it is it offend with actual automobile guardrail is it imitate a kind of research approach of traffic accident to e to test to bump into. It can get automobile sport orbit and sport posture in the course of striking , such true believable technical parameters as the number value of shock power ,etc. of deformation and damage characteristic and colliding of the automobile and guardrail , thus offered the scientific basis for the dependability of other research approach ine results of design and verification of the safe and reliable guardrail structure. Now, various countries bump into the test of the real car of the system to regard as the basic prerequisite studied to the guardrail . Because the way side guardrail itself is a barrier , in a situation that the condition is permitted, the side guardrail of the way should be set up as much as possible and far away from the runway. So, the vehicle which deviates from the runway can perhaps is it answer to sail in the runway again having no accidents most heavy . Way side object exceed from runway edge sure to after worthing , take as the barrier , driver can because reducing speed last position. This distance is called and leant towards the location horizontally . This distance varies with speed, must pay attention to guaranteeing the proper transition is designed when No. link with other structures thing in side guardrails 。s stopping safely, make the vehicle change travel direction, avoid the department and take advantage of personnel39。s subjective judgement of such factors as class of highway , volume of traffic , vehicle making up and way side characteristic ,etc.. The most ideal guardrail form is that meet function39。ROADGUARD BARRIER SYSTEM The roadguard