提出道路交通复杂度分级的思路，对道路线形进行复杂度分级研究，并通过第二任务法测试驾驶员工作负荷的方式进行试验验证。
The paper propose the traffic complexity rating ideas, and research complexity rating for road alignment, and verify it through the second task method testing driver workload.
试验结果表明，该分级方法较机器筛选法更客观、合理，分级结果更符合人们的消费心理和视觉习惯。
It was demonstrated that the classification method was objective and reasonable, and the classification results were more accord with people's consumer psychology and visual habit.
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