General specifications for design of highway bridges and culverts Technical specifications for construction of highway bridges and culverts Specifications for design of foundation of highway bridges and culverts Specifications for design of highway immersed tunnel 并列题名:Specifications for design of highway immersed tunnel Technical specifications for application of pebble concrete to highway bridges and culverts Specifications for design of highway underwater tunnel 并列题名:Specifications for design of highway underwater tunnel Specification for design of highway safety facilities Specifications for design of highway asphalt pavement