Project overview
WSDOT is currently working on design plans to address safety concerns along the State Route 20 corridor between Sedro-Woolley and Burlington. The intent of this project is to improve safety along this busy stretch of highway with the construction of intersection roundabouts, pedestrian crossings, raised median curb to discourage mid-block left turn movements, improved overhead lighting and the removal of a traffic signal to alleviate congestion.
Roundabout locations:
• State Route 20 and Gardner Road (milepost 61)
• State Route 20 and District Line Road (milepost 62)
• State Route 20 and Collins Road (milepost 63)
What to expect
Construction on this project is not scheduled to begin before summer of 2026, however between now and then, crews may be on site occasionally as part of design and pre-construction.
Once construction begins, travelers should expect eastbound and westbound traffic along SR 20 to alternate through a single lane throughout the project.
This project will make intersection improvements along State Route 20 between Burlington and Sedro-Woolley.
WSDOT identified the three intersections along SR 20 between Burlington and Sedro-Woolley as a part of the state’s ongoing highway safety improvement program. A compact roundabout was selected as a cost-effective solution to improve safety for the growing number of vehicles that travel along SR 20.
Roundabouts
Roundabouts are an effective intersection type with fewer conflict points and lower speeds, and they provide for easier decision-making than other intersection types. Well-designed roundabouts have been found to reduce injury collisions by 75% and fatal collisions by 90%. Roundabouts also facility a relatively easy way to make a U-turn allowing adjacent property access without the need for mid-block left turns.
Compact roundabouts, such as the one used in this project, require minimal additional pavement and have completely mountable center islands to make it easier for large trucks to navigate.