Highway Geometry Safety Evaluation Based On Driver Workload

Our country is be placed in the history stage which high speed development of the high transportation, but traffic accident occur multifarious and severe degree. Have already got a high value in the traffic safety problem, pass to carry on the improvement to raise traffic safety level and prevent from the occurrence of traffic accident have already under the premise of consensus become to each main factor of the transportation system, the problem which how scientific, valid, completely make the highway transportation system have higher safe function to become treat to resolve urgently and need a continuously perfect.The current "highway route design norm" is based on the car drive theories, although some parts also considered the human factor, that is subsidiary, fragmentary, and many of that is qualitative, there is no full embodiment with human of mental, physiological need for the principles of main body, influence on the driver to make correctly drive estimate and policy. In the process of driving car, the driver obtains information continuously from the outside environment, and carries on information processing to make a decision and adopt safety drive behavior. The complicated road environment will provide more amount of information for driver, however the human information processing ability have an upper limit, so the complicated road environment will aggravate the driver workload.This thesis is based on the related theories of human work efficiency knowledge, by means of analyze of driver information processing and driver workload, emphasize speed and curvature is the important factors which influence on the driver workload, elicit the mathematic equation which relate speed and curvature to driver workload, and using 3D sketch described the relation of the threes. Then analyzed the attention demand, choosed appropriate workload measure method and test road, the result show that the relationship of attention demand(workload) and operating speedΔV₈₅ is consanguineous, and combine the evaluation criterion ofΔV₈₅ to put forward a set of criterion of highway geometric safety evaluation based on driver workload, and have a certain complement to the current "highway item safety evaluation guidebook". Moreover, it can provide a new scientific basis for checking accident black spot, optimize highway design, guarantee travelling safety.