Multimodal Mobility Dashboard - Central Puget Sound
Region executive summary
This dashboard provides detailed multimodal mobility analyses of five urban highway corridors in the central Puget Sound region, which includes
- Interstate 5 between Federal Way and Everett
- Interstate 405 between Tukwila and Lynnwood
- Interstate 90 between Seattle and Issaquah
- State Route 520 between Seattle and Redmond
- State Route 167 between Auburn and Renton
Central Puget Sound HOV performance analysis is also included and the peak periods for the corridors are defined as 5 - 10 a.m. and 2 - 8 p.m.
2022 Highlights
- In 2022, the average daily person miles traveled as well as delay increased from 2021 by 2% and 35%, respectively, due to the continued recovery of traffic volume across the state in the wake of COVID-19. Along with the recovery of traffic volume was an increase in delay for 2022, but person miles traveled and delay were still below the pre-pandemic levels. Public transportation has been experiencing a slow, steady recovery but remains well below the pre-pandemic level. Park and ride lots were also still below 2019 levels in most areas.
- Due to low traffic congestion throughout the region, volumes remained low at tolled facilities with time-of-day rates, such as SR 520 across Lake Washington, the SR 99 tunnel, SR 167 HOT Lanes, and I-405
- 4.48 billion person miles were traveled on the I-5, I-405, I-90, SR 520 and SR 167 corridors in the central Puget Sound region in 2022, up 2% from 4.39 billion person miles in 2021
- Vehicle delay on the I-5, I-405, I-90, SR 520 and SR 167 corridors in the central Puget Sound region increased 35% from 3.6 million hours in 2021 to 4.9 million hours in 2022
Source: WSDOT Transportation Safety and Systems Analysis Division and WSDOT TRACFLOW (https://tracflow.wsdot.wa.gov/)
Interstate 5
The Interstate 5 corridor in the central Puget Sound region runs between Federal Way and Everett, passing through Seattle. It is the most important commute and economic highway corridor in the region. WSDOT classifies the I-5 corridor between Federal Way and Everett as a T-1 freight corridor, meaning that trucks carry more than 10 million tons of freight annually. The I-5 corridor is served by transit buses, Link Light Rail, Sounder commuter rail, high occupancy vehicle lanes and Amtrak Cascades passenger rail. It is also the part of the "West Coast Electric Highway" which has an extensive network of electric vehicle charging stations every 25 to 50 miles. Click the green bar below for more information on Interstate 5 multimodal mobility analysis.
Interstate 405
Interstate 405 is a key commute and economic corridor in the central Puget Sound region, running parallel to I-5 between Tukwila and Lynnwood. WSDOT classifies the I-405 corridor between Tukwila and Lynnwood as a T-1 freight corridor, meaning that trucks carry more than 10 million tons of freight on this corridor annually. The I-405 corridor is served by transit buses, HOV lanes and, between Bellevue and Lynnwood, by Express Toll Lanes (ETLs). For detailed information about the I-405 ETLs, see I-405 Express Toll Lanes Between Bellevue and Lynnwood | WSDOT (wa.gov). Click the green bar below for more information on Interstate 405 multimodal mobility analysis.
Interstate 90
Interstate 90 runs parallel to SR 520 across Lake Washington and is a key commute and economic corridor connecting I-5 and I-405 in the central Puget Sound region. WSDOT classifies the I-90 corridor between Seattle and Issaquah as a T-1 freight corridor, meaning that trucks carry more than 10 million tons of freight on this corridor annually. The corridor is served by transit buses and high occupancy vehicle lanes. The I-90 floating bridge is the non-tolled alternative to SR 520 across Lake Washington. Click the green bar below for more information on Interstate 90 multimodal mobility analysis.
State Route 520
State Route 520 is a key commute and economic corridor in the central Puget Sound region, connecting Seattle to Eastside suburbs and I-5 to I-405. WSDOT classifies the SR 520 corridor between Seattle and Redmond as a T-1 freight corridor, meaning that trucks carry more than 10 million tons of freight on this corridor annually. The SR 520 corridor 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, see SR 520 Bridge Tolling | WSDOT (wa.gov). Click the green bar below for more information on State Route 520 multimodal mobility analysis.
State Route 167
State Route 167 is a key commute and economic corridor in the central Puget Sound region that functions as an extension of I-405 south of the Tukwila/Renton area. WSDOT classifies the SR 167 corridor between Auburn and Renton as a T-1 freight corridor, meaning that trucks carry more than 10 million tons of freight on this corridor annually. The SR 167 corridor is served by Sounder commuter rail, transit buses, and high occupancy toll lanes. I-405 and SR167 are connected by direct connection that provides seamless connection between the HOT lanes on SR 167 and the high occupancy vehicle lanes on I-405 in Renton. For detailed information about the SR 167 HOT lanes, see SR 167 HOT Lanes | 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. 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 310 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 link for more information about the HOV lane network. Click the green bar below for more information on HOV performance analysis.
