Multimodal Mobility Dashboard - Central Puget Sound

State Route 520

State Route 520 in central Puget Sound region connecting Seattle to Eastside suburbs and I-5 to I-405, is a key economic and commuting corridor. Classified by WSDOT as a T-1 freight corridor it facilitates over 10 million tons of freight annually. SR 520 is served by transit buses and high occupancy vehicle lanes, and the SR 520 Evergreen Point Floating Bridge is tolled in both directions. For detailed information on the tolling of the SR 520 floating bridge, refer to SR 520 Bridge Tolling | WSDOT (wa.gov). For more details on SR-520 multimodal mobility, click the green bar below.

SR 520 multi-year trends

Due to historic decreases in 2020 during the COVID-19 pandemic, analysis here is compared to 2019 to provide a better perspective on whether trends are returning to normal. (Unless otherwise noted travel is measured in general purpose lanes).

• There were 204.6 million person miles traveled in 2024, which was 14.8% lower than the 240.0 million in 2019
• Vehicle delay decreased by 32.5% from 154,000 hours of vehicle delay in 2019 compared to 104,000 hours in 2024

• Peak morning and evening commute times continue to increase in 2024 and are similar to those in 2019

• Severe congestion continued to increase in 2024, however, it was still lower than in 2019 pre-pandemic levels

• In 2024, throughput loss rebounded to pre-pandemic levels, closely resembling productivity declines of 2019

• Buses in 2024 moved up to 0.8% of travelers compared to 2019, where buses moved up to 41.8% of travelers during weekday commutes

• Park and ride lot usage in 2024 averaged 36.8% compared to 94.1% in 2019

State Route 167

State Route 167 in the central Puget Sound region functions as an extension of I-405 south of the Tukwila/Renton area . WSDOT classifies SR 167 between Auburn and Renton is a key economic and commuting corridor. Classified by WSDOT as a T-1 freight corridor, it facilitates over 10 million tons of freight annually. This section of SR 167 corridor supports various transit options, Sounder commuter rail and express toll lanes. I-405 and SR 167 provides a seamless connection between the express toll lanes (ETL) on SR 167 and the high occupancy vehicle lanes on I-405 in Renton. For detailed information about the SR 167 ETL, refer to SR 167 ETL | WSDOT (wa.gov). Click the green bar below for more information on State Route 167 multimodal mobility analysis.

High Occupancy Vehicle Trip Analysis

High occupancy vehicle (HOV) lanes are reserved for carpools, vanpools, buses, motorcycles or any vehicle carrying a minimum number of people (either two or three, depending on the location and time of day), in addition to certain other vehicles granted access by the Legislature.

State Route 167 High Occupancy Toll (HOT) lanes and the I-405 Express Toll (ETL) Lanes are special types of HOV lanes that allow drivers to pay a toll to use the lanes when they don't meet the carpool requirements.

The central Puget Sound region freeway network includes a system of HOV lanes designed to provide faster and more reliable options for travelers. This system also enhances the efficient operation of the freeway network by moving more people in fewer vehicles than adjacent general purpose (GP) lanes.

About 331 lane-miles of the planned 369-mile Puget Sound region HOV network have been completed. These figures reflect the HOV freeway system and exclude ramps and arterials; the planned freeway lane-miles have been updated based on new projects funded through Connecting Washington and additional HOV options such as high occupancy toll lanes and express toll lanes. Click the green bar below for more information on HOV performance analysis.