Translate
Redmond Ridge Drive NE and NE Alder Crest Drive Roundabout Project
Project completed in summer 2024
Crews completed paving, lane striping, and installed native plants in March 2024 at the new roundabout near Redmond, WA.
Project overview
King County built a single-lane roundabout at the intersection of Redmond Ridge Drive NE and NE Alder Crest Drive. The new roundabout makes it easier for pedestrians, wheelchair users, bicycles, and people with strollers to use the intersection.
Construction work started in September 2023 and lasted until summer 2024.
Planning ahead to keep traffic moving in the future
Continued growth of the Redmond Ridge community and nearby business park brings more vehicle traffic to this intersection in the coming years. Building the roundabout now helps to manage projected traffic increase, prevent speeding, and make the intersection safer for middle school students and people walking or rolling to and from the local park and athletic fields. This project provided the county with a rare opportunity to plan now for what the future will bring. Most of the design and construction costs were paid for with state traffic and pedestrian improvement grant money.
Project location map
King County built a new roundabout at the intersection of Redmond Ridge Drive NE and NE Alder Crest Drive. Larger version PDF 117KB
How to use the roundabout
All vehicles may enter the intersection from all four entry and exit points of the roundabout. Drivers enter the roundabout by yielding to traffic that is already in the circle and drive in a counterclockwise direction until they reach their desired exit point.
Extra room for large trucks
The central island includes a truck apron, a raised section of red concrete that acts as an extra lane for large vehicles. The back wheels of the oversize vehicle can ride up on the truck apron so the truck can easily complete the turn.
Pedestrians and non-motorized vehicles
Signed crosswalks and separated sidewalks allow people to safely walk across all lanes. Accessible curb ramps will make it easier for bikes, strollers, and wheelchairs to use the crosswalks.
Frequently asked questions
Photos
The new roundabout at Redmond Ridge Drive NE and NE Alder Crest Drive opened to traffic on Monday, November 13, 2023.
November 9, 2023: crews prepare the first layer of asphalt for paving the new roundabout at the intersection of Redmond Ridge Drive NE and NE Alder Crest Drive.
Oct. 31, 2023 – Crews plan the next steps of the Redmond Ridge roundabout at NE Alder Crest Dr.
Oct. 31, 2023 –Vehicles will be able to enter the intersection when it’s complete from all four entry and exit points of the roundabout. Drivers enter the roundabout by yielding to traffic that is already in the circle and drive in a counterclockwise direction until they reach their desired exit point.
Oct. 31, 2023 – A crew member takes more measurements to ensure that after the grinding, the remaining hot mix asphalt (HMA) thickness is the King County standard.
October 5, 2023: Crews scrape away the road to make space for the new roundabout at the intersection of Redmond Ridge Drive NE and NE Alder Crest Drive
A view of the intersection before the start of construction. The photo above faces west on NE Alder Crest Drive approaching NE Redmond Ridge Drive. The Redmond Fire Station is across the street on the right-hand side.
Redmond Ridge Drive facing north. Photo taken before the start of construction.
King County will build a roundabout at this intersection to manage the increase in traffic near the City of Redmond.