路面设计年限是由道路管理者确定的，他们是通过总体考虑施工造价和路面结构

Pavement design life is determined by road managers. They are determined by overall consideration of construction cost and pavement structure supervision, the impact of construction operations on road traffic and the regional environment, road operation plans and other conditions. <br>The estimated traffic volume of the pavement structure is calculated by road managers, who assume two-lane or less one-way traffic, for the daily traffic volume of large vehicles driving in one lane, and three or more one-way traffic, Not less than 70% of the daily traffic volume of large vehicles driving in one lane, and the traffic distribution of large vehicles on each lane should be considered.

Road design years are determined by road managers, who determine the overall cost of construction and road structure supervision, the impact of road traffic construction operations and regional environment, road operation plans and other conditions.<br>The estimated traffic volume of road structure is calculated by road managers, who assume that two lanes or less of one lane, the daily traffic volume of large vehicles traveling in one lane, and the one-way traffic of three or more lanes, is not less than 70% of the daily traffic volume of large vehicles traveling in one lane, taking into account the traffic distribution of large vehicles in each lane.

The pavement design period is determined by the road managers, who are determined by overall consideration of the construction cost and pavement structure supervision, the impact of road traffic construction operation and regional environment, road operation plan and other conditions.<br>The estimated traffic volume of pavement structure is calculated by road managers. They assume that the daily traffic volume of large vehicles in one lane and three or more lanes are not less than 70% of the daily traffic volume of large vehicles in one lane. The traffic distribution of large vehicles in each lane should be considered.<br>