方案的编制应将重点放在开发建设项目的可行性研究阶段，水土保持方案要对主体工程设计提出约束条件。
The plan should be made in the feasibility study stage so that restriction conditions are given by the water and soil conservation plan to the design of main part of the project.
高速公路设计是由路桥主体工程设计和交通工程机电土建设施设计组成的复杂系统工程，后者对前者有相当大的影响。
The expressway design is formed by the main road-bridge design and traffic engineering and road facilities as a multi-system construction. The latter would give a great influence to the former.
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