City expressway alignment design optimization method under ice and snow condition

The invention provides a city expressway alignment design optimization method under an ice and snow condition. The city expressway alignment design optimization method comprises the following parameter steps: 1) optimizing a maximum slope length parameter under the ice and snow condition; 2) optimizing a maximum gradient parameter under the ice and snow condition; and 3) optimizing a circular curve extremity minimum radius under the ice and snow condition. The city expressway alignment design optimization method has the following advantages that a maximum longitudinal slope, a maximum longitudinal slope length design index value and a suggested reference value of a minimum parking sight distance of the city expressway under the ice and snow condition are put forward, geometrical parameters including the circular curve extremity minimum radius, a highest superelevation rate and the like are standardized, a more detailed geometrical index value reference is provided for the designer of the ice and snow area expressway, and the city expressway alignment design optimization method has an important practical significance for accelerating the safety production and the economic development of northern ice and snow areas.