Technical guidelines for design and construction of highway subgrade in saline soil region Technical specifications for design and construction of highway subgrade in loess region Technical guidelines for design and construction of highway retaining walls Technical specifications for design and construction of highway in seasonal frozen soil region 并列题名：Technical guidelines for design and construction of highway retaining walls Guidelines for design and construction of highway engineering in the mined-out area Technical guide for design and construction of aeolian sand tunnel Technical specifications for design and construction of highway in permafrost area Specifications for design and construction of highway tunnels with gas Technical guidelines for construction of highway tunnel