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No, the traffic circle will comply with all applicable standards appropriate to the roadway. These circles were designed with elements of City of Redmond Standard Traffic Circle Detail, WSDOT Curb 1 Roundabout Truck Apron (F-10.18-03), and King County Sign and Post Details. These standards are used on comparable residential roads. Washington State Department of Transportation (WSDOT) standards typically apply to larger, higher-speed, higher-traffic roadways.
There will be a traffic apron to allow large vehicles to drive over when needed. The design has been discussed with the Redmond Fire Department, and they have no concerns with the design.
We have also heard this rumor that Perteet said that traffic circles are ineffective and we have no idea where the rumor originated. Perteet is designing the current traffic circles because they are a proven traffic calming measure. All traffic circles and roundabouts are rotary-style traffic control measures. When properly implemented, they force drivers to make steering inputs, change the direction and speed of travel, and focus on the road. Traffic circles also reduce the likelihood of T-bone accidents, which have a high risk of major injury.
172nd Ave NE is not considered a primary emergency vehicle route. The design of this traffic circle is fully mountable, meaning it allows emergency vehicles to travel over the traffic circle with minimal delay, if any.
No, the existing traffic circle at NE 112th St. is not a comparable example. It does not provide sufficient deflection due to the presence of a bike lane, and it is too small for the overall intersection width. The new traffic circles we are installing will have dimensions based on intersection width. We will also have posts to delineate traffic. The city is making plans to correct existing ineffective traffic circles around the city.
The curbing will be made of plastic and bolted into the ground
Speed cushions have been extensively studied and have been shown to reduce speeds. The Federal Highway Administration’s Traffic Calming e-Primer states that vehicles can traverse speed cushions at speeds of 20-25mph. Depending on the speed of the approach, this could result in speed reductions of 5-13mph. The 172nd Ave NE speed study conducted in March of 2023 showed the 85th percentile speed ranging from 29.1 to 33.1mph. Given these numbers, we can expect the speeds of vehicles on 172nd Ave NE to be reduced by 4-13mph at the speed cushions.
This section of the road has ten-foot lanes in each direction. West Lake Sammamish Parkway is also ten feet wide in each direction, and traffic travels in both directions without incident. Narrow roads also encourage lower speeds. Channelization and a center line will be installed on the south side of the gate as part of construction.
No, there is no bike lane on this section of road.
The plan is to begin construction in Spring of 2024, but there is no certain end date. We estimate a construction phase of three months. Due to many variables, a specific completion date cannot be provided. Construction is weather and contractor-dependent.
The gate will be opened after the traffic calming measures along 172nd Ave. NE are installed. Spring 2024 is the earliest that construction could begin, but it could be later as construction is contractor and weather-dependent.
This project was outlined in the Transportation Master Plan (TMP), which was adopted as part of the 2023-2024 Capital Improvement Plan (CIP).
The City did not commit to installing a traffic signal at that intersection, and it is not clear that a traffic signal is the proper mitigation strategy for that intersection. The City committed to installing the traffic calming measures along 172nd Ave. NE before opening the gate. The City has increased the number of mitigation measures included in that plan and will pay for all of them. The intersection of 162nd Place NE and NE 124th St. is still being studied to determine if a traffic signal, roundabout, or other traffic calming measure will be most effective, and funding for those improvements has yet to be budgeted.
Staff have coordinated with the Redmond Police Department regarding safety and speeding along this route and will schedule additional patrols during school hours. Even with the gate open, traffic projections suggest that Clara Barton will continue to have significantly less traffic than other elementary schools in Redmond.
The King County Sheriff’s Office has jurisdiction to enforce speed limits north of the gate. We’ve discussed with them the possibility of a targeted enforcement effort when the gate is opened. The City will also conduct follow-up speed studies.
We encourage all pedestrians to look both ways and ensure the road is clear and safe before crossing.
North of the intersection of 172nd Ave. NE and NE 124th St. is King County. The county considers this section of road to be a rural road, and their design standards do not include sidewalks for rural roads. Lane lines will be installed, differentiating the driving lanes from the pedestrian parts of the roadway.
John Taylor, King County Director of Local Services, attended.
This Q&A has been updated with all the questions noted at the meeting, and the meeting chat has been added to the web page.
No, our intention was to record the meeting, which was originally planned as a Teams Live Event. To allow greater audience participation, including allowing audience members to speak instead of writing in questions, we changed the meeting format from a Teams Live Event to an enterprise Teams Meeting. At our organization, recording of Teams Meetings requires advanced coordination with our Technology and Information Services (TIS) Department, as that capability is normally disabled enterprise-wide. With the last-minute change, we did not have time to coordinate recording permissions with TIS.
The project has multiple goals. The gate opening will improve the traffic system's overall access, mobility, and circulation. At the same time, the City is installing significant traffic calming measures to discourage excessive cut-through traffic once the gate is open.
While the Fire Department does have remote access to unlock the gate, stopping to open the gate still slows emergency vehicles. Open roads are also more reliable than a remotely accessed gate.