The Preliminary Engineering and Design phase of both construction and non-construction projects includes the development of design guidelines that include requirements specified by state and federal statutes. This phase also includes the development of design layouts for non-construction projects and design schematics for roadway projects depicting the geometrics proposed for the project.

This section of the LGPP Manual and (LGPM Guide) describe general design guidelines that should be addressed in the early stages of the project design. The required practices and general procedures are covered in detail in the LGPM Guide, while this Manual provides the supporting state and federal laws and statutes regulating these practices.