South Puget Sound Interstate 5 - Dashboard
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Performance indicators for the I-5 corridor in the south Puget Sound region
Indicators
This dashboard shows three multimodal performance indicators of highway performance for Interstate 5 in the south Puget Sound region: annual general purpose lane person miles traveled, annual GP vehicle delay, percentage of park and ride spaces occupied.
For details on methodology to calculate person miles traveled and vehicle delay, refer to WSDOT's Handbook for Corridor Capacity Evaluation (PDF 5.9 MB).
Sources: WSDOT Transportation Safety and Systems Analysis Division and WSDOT TRACFLOW (https://tracflow.wsdot.wa.gov/)
Multi-year trends
In 2021, annual GP person miles traveled and vehicle delay increased from 2020, due to recovery of traffic volume, but still lower than the pre-pandemic level. In 2020, the statewide response to the COVID-19 mitigation policy, such as an increase in telework and no large gatherings of events, resulted in reduced traffic. This significantly reduced the GP person miles traveled and vehicle delay compared to previous years. On the I-5 corridor in the south Puget Sound region, annual GP person miles traveled and annual GP vehicle delay were both higher in 2019 than in 2017. In contrast, the percentage of park and ride spaces occupied decreased from 2017 through 2019, then dropped significantly in 2018 before recovering slightly in 2019.
Annual highlights
In 2021, annual GP person miles traveled and vehicle delay increased from 2020, due to recovery of traffic volume, but still lower than the pre-pandemic level. Nearly 1.6 million person miles were traveled in the GP lanes on I-5 between Olympia and Federal Way, a 11% increase from 2020. Travelers on this corridor experienced 1.5 million hours of vehicle delay in 2021, up 135.4% from 0.6 million in 2020. Approximately 25% of parking spaces at park and ride lots on this corridor were occupied in 2021, down from 29.1% in 2020.
In 2020, the statewide response to COVID-19 resulted in a significant reduction in GP person miles traveled and annual delay. Nearly 1.4 million person miles were traveled in the GP lanes on I-5 between Olympia and Federal Way, a 13% decrease from 2019. Travelers on this corridor experienced 618 thousand hours of vehicle delay in 2020, down 74% from 2.4 million in 2019. Approximately 30% of parking spaces at park and ride lots on this corridor were occupied in 2020, down from 80.5% in 2019.
In 2019, nearly 1.6 billion person miles were traveled in the GP lanes on I-5 between Olympia and Federal Way, the same as in 2018. Travelers on this corridor experienced 2.4 million hours of vehicle delay in 2019, up 24% from 1.9 million in 2018. Approximately 81% of parking spaces at park and ride lots on this corridor were occupied in 2019, up from 76% in 2018.
In 2018, nearly 1.6 billion person miles were traveled in the GP lanes on I-5 between Olympia and Federal Way, the same as in 2017. Travelers on this corridor experienced 1.9 million hours of vehicle delay in 2018, the same as in 2017. Approximately 76% of parking spaces at park and ride lots on this corridor were occupied in 2018, down from 86% in 2017.
In 2017, nearly 1.6 billion person miles were traveled in the GP lanes on I-5 between Olympia and Federal Way, the same as in 2016. Travelers on this corridor experienced 1.9 million hours of vehicle delay in 2017, down 24% from 2.5 million in 2016. Nearly 86% of parking spaces at park and ride lots on this corridor were occupied in 2017, up from 85% in 2016.