The determination of speed limit value of expressway has an important influence on the traffic quality of expressway, new expressways have their own advantages in road conditions, traffic interference and traffic composition, which provide conditions for high-speed driving. Combine the different speed characteristics of different expressways to select the corresponding speed limit standard, which can effectively exert the transportation function of the expressway. On the basis of comparative analysis of the formulation methods of speed limit standards at home and abroad, this paper summarizes the relationship between design speed, operation speed, expected speed and posted speed of newly built expressways, qualitatively puts forward the determination principle of speed limit scheme for newly built expressways, and tests the applicability of this principle in combination with Xuan'qu Expressway in Yunnan Province. The result shows that the speed limit scheme amended by this principle can effectively meet the driver's driving expectations and improve road traffic efficiency on the premise of ensuring safety.

CICTP

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