Specifications for design and construction of highway tunnels with gas Technical specifications for design and construction of highway in permafrost area Technical specifications for design and construction of highway subgrade in loess region Specifications for design and construction of asphalt pavement of expressway Technical guidelines for design and construction of highway retaining walls Technical specifications for design and construction of highway in seasonal frozen soil region Specifications for seismic design of highway tunnels Specifications for design of highway tunnels Specifications for design of foundation of highway bridges and culverts Guidelines for design and construction of immersed tunnels