Chapter 6 - Cross Section Elements

6.2. Typical Section Geometrics

GDOT has developed standard typical sections that include most designs currently used for Georgia's state roads. The GDOT standard typical sections meet current AASHTO design standards and are maintained and updated by GDOT’s Plan Presentation Committee.

The GDOT standard typical sections delineate the approved geometric values to be used for both urban and rural roadways, based on functional classification. Also shown are the values for lane widths, shoulder widths, side slopes, and preferred ditch sections. These values, which are listed in the below-listed tables, represent GDOT design standards:

• Table 6.1. GDOT Design Standards for Local Roadways
• Table 6.2. GDOT Design Standards for Collectors
• Table 6.3. GDOT Design Standards for Arterials
• Table 6.4. GDOT Design Standards for Freeways

The standard typical section should be modified by the designer, as necessary, to meet project-specific conditions based on AASHTO guidance set forth in the current AASHTO A Policy on the Geometric Design of Highways and Streets (Green Book) and the standards set forth in this Manual.

As previously noted, the Concept Development Phase will set the approved values and typical sections to be used. Should any proposed value be less than AASHTO Design Standards, a design exception will be required. Refer to the GDOT Plan Development Process for further guidance on completing design exceptions. On Federally funded projects, the typical section is subject to Federal Highway Administration (FHWA) approval.