What are the contracting models for highway projects?

Legal subjectivity:

The methods of contracting construction projects are as follows: 1. General contracting: The enterprise is entrusted by the construction unit to contract the entire process or several stages of the project in accordance with the contract; 2. Independent contracting: the contractor signs survey, design, and construction contracts with the surveyor, designer, and constructor for the construction work; 3. Joint contracting: two or more units with different qualification levels jointly contract; 4. Affiliated contracting : Contracting in the name of a certain engineering enterprise.