Multimodal mobility dashboard - South Puget Sound region

Region executive summary

This dashboard includes a detailed multimodal mobility analysis of the Interstate 5 corridor between Federal Way and Olympia in the South Puget Sound region. The peak periods for the I-5 corridor in the South Puget Sound region are defined as 5 - 10 a.m. and 2 - 8 p.m.

2021 Highlights

  • In 2021, the average daily person miles traveled increased from 2020 due to the recovery of traffic volume across the state. Along with the recovery of traffic volume was an increase in delay for 2021, but both person miles traveled and delay were still lower than pre-pandemic levels. Public transportation has been experiencing a slow, steady recovery but remains well below pre-pandemic levels. Park and ride lots are also still below 2019 levels in most areas
  • Vehicle delay on the I-5 corridor in the South Puget Sound region increased 135.5% from 0.62 million hours in 2020 to 1.46 million hours in 2021
  • Approximately 1,559 million person miles were traveled on the I-5 corridor in the South Puget Sound region in 2021 up 10.8% from 1,407 million person miles in 2020
  • During the southbound morning commute in 2021, buses (3.2% of all vehicles) moved 3.2% of travelers on I-5 at Port of Tacoma Road
I-5 map image

Source: WSDOT Transportation Safety and Systems Analysis Division and WSDOT TRACFLOW (

Interstate 5

Interstate 5 is the primary commute and economic corridor connecting the central and south Puget Sound regions. WSDOT classifies the I-5 corridor between Olympia and Federal Way as a T-1 freight corridor, meaning that trucks carry more than 10 million tons of freight on this corridor annually. This corridor is served by transit buses and, between Federal Way and Tacoma, by high occupancy vehicle lanes. It is also paralleled by the Amtrak Cascades passenger rail line. Click the green bar below for more information on Interstate 5 multimodal mobility analysis.

I-5 map image
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