Grade II general contracting of highway engineering constructionProfessional contracting of highway subgrade worksProfessional contracting of highway safety facilities for highway traffic engineering Class IProfessional contracting of highway pavement works Class IISubgrade and pavement maintenance Class ASubgrade and pavement maintenance Class ABridge maintenance, Grade ABridge maintenance, Grade A
Bridge maintenance, Grade ABridge maintenance, Grade ATunnel Maintenance, Class ATunnel Maintenance, Class AMaintenance of traffic safety facilities is not gradedMaintenance of traffic safety facilities is not gradedGrade II general contracting of highway engineering constructionHighway traffic engineering highway safety facilities professional contracting secondary
Grade II general contracting of highway engineering constructionMaintenance of traffic safety facilities is not gradedMaintenance of traffic safety facilities is not gradedBridge maintenance, Grade ABridge maintenance, Grade ATunnel Maintenance, Class ATunnel Maintenance, Class ASubgrade and pavement maintenance Class A
Subgrade and pavement maintenance Class ASubgrade and pavement maintenance Class ATunnel Maintenance, Class ATunnel Maintenance, Class ABridge maintenance, Grade ABridge maintenance, Grade AHighway traffic engineering highway safety facilities professional contracting secondaryGrade II general contracting of highway engineering construction
Maintenance of traffic safety facilities is not gradedMaintenance of traffic safety facilities is not gradedClass II general contracting of construction worksTunnel Maintenance, Class ATunnel Maintenance, Class ASubgrade and pavement maintenance Class ASubgrade and pavement maintenance Class AConstruction labor is not graded
Tunnel Maintenance, Class ATunnel Maintenance, Class AMunicipal Public Works Construction General Contracting Level IIGrade II general contracting of highway engineering constructionProfessional contracting of highway pavement works Class IIConstruction labor is not gradedConstruction Safety Production PermitNational construction market warehousing enterprises regardless of grade
Tunnel Maintenance, Class ATunnel Maintenance, Class ABridge maintenance, Grade ABridge maintenance, Grade AMaintenance of traffic safety facilities is not gradedMaintenance of traffic safety facilities is not gradedGrade II general contracting of highway engineering constructionMunicipal Public Works Construction General Contracting Level II
Transportation enterprise safety production standardization level 1Water conservancy and hydropower project construction general contracting level IITunnel Engineering Professional Contracting Class IHighway traffic engineering highway safety facilities professional contracting secondaryElectrical and mechanical engineering construction general contracting level 1Municipal Public Works Construction General Contracting Level IIBridge Engineering Professional Contracting Level IHighway Engineering Construction General Contracting
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