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In order to improve safety and travel-time predictability on I-205, the project makes changes to on- and off-ramps and intersections around interchanges.
The project includes ODOT RealTime traffic information signs to help travelers get to where they’re going more safely and efficiently. These signs can display traffic flow information, roadway conditions, and advisory speeds limits.
A roundabout improves safety and operations compared to a signalized intersection. The table below shows traffic control options considered at the northbound I-205 ramp terminal:
|Interstate Access* from OR 43 Southbound|
|Interstate Access from OR 43 Northbound|
|Operations on OR 43|
|Access to/from Willamette Falls Drive|
|Compatibility with future improvements|
|Life-cycle cost savings|
Ratings: = Positive = Neutral = Negative
*Proposed improvements include removal of the existing ramp meter and extension of the auxiliary lane to OR99E exit-ramp.
Source: A Safer Choice (FHWA-SA-08-006, a Roundabout Informational Guide)
Morning (AM) Peak Traffic Simulation
Afternoon (PM) Peak Traffic Simulation
If noise levels at a property exceed 65 decibels, the design team will evaluate noise mitigations. Noise walls are the most common tool used to mitigate noise. If noise walls are found to provide adequate benefits based on ODOT and Federal Highway Administration standards, benefited property owners will be able to vote this fall on whether or not to have noise walls constructed. If more than 50 percent of benefited property owners vote in favor of a reasonable noise wall, the wall will be constructed.
What is a decibel?
A decibel is a unit used to measure sound levels. Decibels help us understand and define how loud or quiet something is.
Note: Humans do not usually notice a change in noise of three decibels or less.
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