Specifications for design and construction of asphalt pavement of expressway Specifications for maintenance design of asphalt pavement of expressway Specifications for design and construction of highway tunnels with gas Technical specifications for design and construction of highway subgrade in loess region Technical specifications for design and construction of highway in permafrost area Specifications for design of highway asphalt pavement Technical specifications for design and construction of highway in seasonal frozen soil region Technical specifications for design and construction of special road in automotive proving ground Technical guide for design and construction of aeolian sand tunnel Technical code for design and construction of full thickness semi-rigid base course of highway