- Adding a single southbound auxiliary lane on I-5 from north of Lower Boones Ferry Road to I-205 to relieve congestion and reduce crashes. The auxiliary lane work includes on- and off-ramp lane modifications at Lower Boones Ferry Road and Nyberg Street, and the on-ramp to I-205.
- Adding a second lane at the northbound exit ramp for Lower Boones Ferry Road to relieve congestion.
- Repaving I-5 from Highway 99W to I-205, approximately 5.5 miles. This will extend the service life of the road for another 10-15 years. By combining the pavement and southbound auxiliary lane work, the project will take advantage of cost savings and reduce construction impacts to travelers.
- Modifying signs, lighting, striping and building retaining walls
Auxiliary Lanes - improve highway bottlenecks, reduce congestion and improve safety
A recent ODOT study found that auxiliary lanes are an effective way to reduce bottleneck congestion. An auxiliary lane typically provides a direct connection from one interchange ramp to the next. In fact, there is an existing auxiliary lane from the Hwy 217 off-ramp to the Lower Boones Ferry Road off-ramp. This project extends that auxiliary lane to I-205 to improve safety and traffic flow along I-5.
Auxiliary lanes separate on- and off-ramp merging from through traffic. They require less weaving and merging, reducing congestion in all lanes.
In 2009, ODOT began a new approach to deal with major recurring bottlenecks on local freeways and develop cost-effective improvements to address safety and assess traffic movement at certain locations.
The Federal Highway Administration has found that approximately forty percent of all congestion is predictable, caused by bottlenecks or physical constraints of the roadway. Many bottleneck locations are also high-crash sites. Crash incidents increase congestion levels, causing more delay and longer recovery time for the freeway.
The Corridor Bottleneck Operations Study identified areas of recurring congestion along five key Portland metro area corridors (I-5, I-205, I-84, I-405 and US 26). The study recommended low-cost, highly effective solutions to improve safety and reduce congestion at these locations. In many cases, auxiliary lanes were the recommended solution. Learn more about the study by reading visiting the CBOS website
, reading the CBOS fact sheet
and by viewing the CBOS video
from Highway 99W to I-205
Cost and Funding
Oregon Mainline Paving
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