Project News

The City has completed its Military Road South Five-Way Intersection Study, and it has been adopted by the City Council. You can view the completed study here.

The City Council formally adopted the study at its November 23, 2021 meeting after a presentation from staff (Agenda Bill #5644, Resolution #21-1036).

The City will proceed with planning and implementing the intersection design (a roundabout) recommended in the study. Additional funding will need to be identified before any significant work can begin. 

Study Area

Study Background

The City of SeaTac studied the intersection at Military Road South, South 164th Street, and 42nd Avenue South to determine a configuration that will improve mobility and safety for people driving, walking, or biking through the intersection.

The intersection is heavily utilized as it connects several important destinations between SeaTac and Tukwila. The current five-way intersection can be complex to navigate, resulting in a history of safety issues and high traffic volumes during peak hours.

Study elements

As part of this study, the City evaluated several options for improving traffic flow and safety for all users.  The study developed multiple design concepts for the best configuration of the intersection by reviewing:

• Traffic and collision history data
• Anticipated growth and future needs
• Safety analysis
• Community input 

Several types and combinations of improvements were considered at the intersection, including:

• Traffic circle/roundabout
• Traffic signal timing
• Roadway realignment
• Landscaping and beautification
• Extended sidewalks
• Bike lanes

Study benefits

The study’s goal was to determine an intersection design that will:

• Increase safety for all modes of travel
• Improve traffic operations and travel times
• Enhance the experience of people walking and biking
• Establish a clear visual identity for the streetscape that connects the neighborhood to the rest of the City.

More Information

To find out more about this study, please contact Florendo Cabudol, City Engineer. 206.973.4740, FCabudol@seatacwa.gov