Comprehensive Development Agreements (CDAs) are comprised of contracting methods that include design, construction and maintenance of highways. Under CDAs, there are two major types of projects: concession and non-concession.

Concession projects require a long-term (more than 20 years) maintenance agreement. In this case, performance (ride, rut, distress, etc.) requirements are defined as criteria to be maintained on the project throughout the term of the agreement.

Non-concession projects have a short-term or no maintenance agreements. In this case, design and construction specifications are prescribed for projects.

The scope of this manual includes only traditional TxDOT projects.